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The E-Z-GO TXT platform runs from 1995 straight through the 2026 model year, and the new Valor 4 and Express S4 still ride on the same steel-frame chassis. So rear-seat fitment is a solved problem — if you buy the right cushion. What changed for 2026 is the stakes: with FMVSS 500 governing street-legal LSV operation in all 50 states, seat integrity and UV resistance are regulatory prerequisites, not cosmetic preferences.

This guide breaks down the Koeep Black Rear Seat Cushion Set, SKU KK-EZ-RC-BLK-5452: what it fits, how it is built, how it behaves around 2026 electronics, and when to replace worn cushions before collapsed foam puts a code on your dash.

What the Set Is and What It Fits

The Black Golf Cart Rear Seat Cushion Set for EZGO TXT, ST, ST Sport & Valor Models is a 2-piece rear cushion assembly — one backrest plus one seat bottom — engineered for the 2026 E-Z-GO lineup, including the refreshed Valor PTV, the Freedom RXV, and the legacy TXT. The outer skin is marine-grade, UV-stabilized vinyl conforming to SAE J369 flammability resistance standards.

Coverage spans the full TXT-heritage platform:

• EZGO TXT, model years 1995 through 2026
• ST and ST Sport
• 2026 Valor 4
• Express S4
• Freedom RXV, when equipped with TXT-pattern rear seat frames

Powertrain does not matter. The cushions carry no electronics, so they work on every E-Z-GO 48V AC-drive cart and EX1 gas platform without interference.

Why the 2026 Model Year Changed the Material Standard

Textron Specialized Vehicles, E-Z-GO's parent company, has progressively adopted marine-grade vinyl as the factory standard across the Valor, Freedom, and Express trims. That is a deliberate move away from the older low-durometer PVC blends, which showed accelerated cracking under ASTM G154 Cycle 1 UV exposure testing.

Foam, durometer, and tear resistance

The Koeep set mirrors the new factory spec. A high-density closed-cell foam core is laminated to the UV-stabilized vinyl outer skin, and the assembly measures 45–55 Shore A — the industry-recognized sweet spot for all-day comfort without sacrificing tear resistance, tested to ASTM D624, Die C.

Why black outlasts gray or beige

The black colorway carries carbon-black pigmentation at ≥2.5% loading by weight. That is the threshold where UV stabilizer synergy becomes self-sustaining, effectively halving the degradation rate versus lower-concentration grays or beiges. The shade reads as RAL 9005, Hex #0A0A0A equivalent.

For fleet carts running 2026 Valor 4 or Express S4 trim in sun-belt states — AZ, FL, TX, NV — plan on a 4–5 season service interval before observable fade or surface micro-cracking initiates.

Dimensions, Tolerances, and Frame Compatibility

The seat bottom measures 36.61″ W × 18.90″ D. The backrest spans 38.98″ W × 15.55″ H. Both pieces are held to ±0.15″ tolerances (ISO 2768-mK), and that precision is what makes the set a drop-in on OEM and aftermarket flip-seat frames.

Verified aftermarket frame patterns

Fitment has been verified against MadJax Genesis 250, GTW Mach 2/3, and Gusto-series rear seat kits, in addition to factory brackets. Freedom RXV carts join the list whenever they carry TXT-pattern rear seat frames.

What is — and is not — in the box

You get two pieces: backrest and seat bottom. Mounting hardware is not included, because the set is built for re-covering an existing flip-seat frame with your factory bolts and brackets reused. Seat the vinyl edge flat at the hinge fold-points — that is where stress cracking shows up first on tired cushions.

Technical Specification Matrix

The complete data backbone for SKU KK-EZ-RC-BLK-5452, with the test standard behind each value:

Diagnostics: Cushions, DTCs, and the 2026 Sensor Ecosystem

A seat cushion generates no diagnostic trouble codes on its own. It has no sensors, no occupancy mats, and no wiring pass-throughs, and it does not interface with the CAN-bus network or the Body Control Module in any capacity.

How a worn cushion still puts a code on the dash

Degraded or collapsed foam changes where the passenger sits relative to the belt tension sensor. On LSV-configured 2026 E-Z-GO carts with seat belt interlock sensors, that positional shift can flag a Body Control Module DTC in the B00xx range for inconsistent seat belt latch status.

The specific code to watch is B0052, Passenger Seat Belt Sensor Circuit Range/Performance, readable through Textron's proprietary diagnostic interface. It typically appears when a cushion obstructs the belt latch anchor point — a real risk on 2026 Freedom RXV LSV configurations with aftermarket interlock sensors.

DTC ranges worth cross-referencing

• B0050–B0059 — seat belt sensor / occupant classification circuit; cushion compression alters occupant position.
• U0140–U0149 — lost communication with the Body Control Module; BCM seat sensor polling may flag anomalies caused by cushion degradation.

Fleets facing NHTSA roadside LSV compliance audits under FMVSS 500 §571.500 should cross-reference cushion replacement during annual LSV safety recertification instead of waiting for collapsed foam to corrupt occupant classification calibration.

What CAN-bus 3.0 governs — and what it ignores

The 2026 RXV's CAN-bus 3.0 upgrade, with its 10-inch ECOXGEAR IntelliScreen and electronic push-to-start, governs powertrain, lighting, and infotainment exclusively. Seat cushions stay entirely mechanical, so there is no bus conflict on any TXT-platform or RXV rear-seat frame.

Failure Patterns and Maintenance

Cracking after one season on a 2026 Valor

The 2026 Valor ships from E-Z-GO's Augusta, GA facility with base-grade PVC seat vinyl on entry-level trims. Run it in a high-UV region without a storage cover and the plasticizer migrates to the surface and off-gasses within 8–12 months, leaving brittle vinyl that develops Type II stress cracking at the fold-points along the flip-seat hinge line.

The carbon-black-infused vinyl on the Koeep set is rated for ≥2,500 kJ/m² of cumulative UV exposure — roughly 5× the durability of entry-level OEM PVC under ASTM G154 testing. That is the difference between a yearly cushion job and a 4–5 season plan.

Mold and mildew in humid climates

The marine-grade vinyl incorporates antimicrobial additives compliant with ASTM E2180, the hydrophilic coating test for mildew resistance. For carts stored outdoors in Gulf Coast humidity, apply a silicone-based UV protectant — 303 Aerospace Protectant or equivalent — every 90 days to keep the non-porous surface intact.

Buying, Fleet Support, and Where to Look Next

Order the set from the official Koeep product page. The same TXT, ST, ST Sport, and Valor fitment is also carried in Koeep's Black Golf Cart Rear Seat Cushion Set listing — two storefront entries for the same platform coverage.

• Front bench faded too? The Black Golf Cart Front Cushion Seat Cover for EZGO TXT keeps the whole cabin one color.
• Want the long-form walkthrough? The complete guide to this cushion set covers the same fitment in depth.
• Shopping the whole cabin — mats, covers, trim? Start at the interior auto parts collection.

Bulk and fleet buyers can submit the request-for-quote form for volume pricing. Support is reachable by email at support@koeep.com or on WhatsApp at +86 181 3883 8291.

Frequently Asked Questions: 2026 EZGO Rear Seat Cushions