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Quick Answer: What This Set Is and Who It Fits

The Black Golf Cart Rear Seat Cushion Set (KOEEP #4013) replaces worn cushions on aftermarket rear flip-seat kits for E-Z-GO TXT (1994.5–2026), RXV (2008+), ST, ST Sport, Valor and MPT platforms. It is a direct-fit swap: the mounting geometry matches the OEM TXT rear bench, so you cut and fabricate nothing.

Dimensions copy the OEM TXT rear bench spec. Bottom cushion: 42"W at the front, tapering to 40"W at the rear, 20.5" deep. Backrest: 16"H × 10"D. That footprint covers the 2026 Valor 4 PTV — the 48V AC-drive model on the TXT-heritage steel frame — with no modification.

Fast Answers Before You Buy

• Safe with 2026 CAN-bus 3.0? Yes — passive component, no interference with Curtis 1268/1234SE controllers or E-Z-GO IntelliBrake®.
• FMVSS 302 compliant? Yes — vinyl and foam meet the ≤4 in/min horizontal burn rate per SAE J369.
• Fits the 2026 Valor 4 PTV? Yes — same rear-seat footprint as the TXT.
• UV rating? 1,000+ hours SAE J2412 xenon-arc; marine vinyl with anti-fungal and anti-microbial treatment.
• Street-legal LSV use? Yes — supports FMVSS 500 seating requirements when paired with DOT-approved seat belts.

Fitment: Confirmed Platforms and One Clear Exception

Confirmed direct fit: TXT (1994.5–2026), RXV (2008+), ST, ST Sport, Valor and MPT, all with aftermarket rear flip-seat kits. The 2026 Valor 4 PTV is validated. Mounting geometry on TXT-heritage platforms stays common into Model Year 2027, so the set carries forward with those carts.

The One Cart It Does Not Fit

The 2026 E-Z-GO Liberty 4F uses an all-forward-facing seat architecture, not a rear flip seat. This set targets flip-seat geometry only, so skip it for the Liberty 4F. If your 2026 model is a Valor 4 PTV — not a Liberty — fitment is confirmed.

If the main listing is sold out, the identical set is stocked under two alternate catalog entries: this TXT/ST/ST Sport/Valor listing and this matching alternate listing. For mats, trim and other cabin parts, browse the full interior parts collection.

Material Build: Three Layers, Each With a Job

Layer 1 — the skin

28-oz marine-grade vinyl in black, loaded with UV inhibitors and benzotriazole-class absorbers. Color fastness holds Grade 4–5 on the AATCC 16.3 scale. The plasticizer package is polymeric and non-migratory, so the skin stays supple instead of turning brittle — the exact failure mode that kills factory seat vinyl.

Layer 2 — the waterproof barrier

A closed-cell polyethylene membrane (IPX5-equivalent) sits under the vinyl and blocks water from reaching the foam. Power-wash the cart or get caught in rain: the foam never saturates, and no water travels down into the under-seat electronics bay.

Layer 3 — the foam core

2.2 lb/ft³ high-resiliency polyurethane foam that keeps ≥85% rebound efficiency after 100,000 compression cycles per ASTM D3574. Factory E-Z-GO TXT seats run 1.6–1.8 lb/ft³. The denser core gives rear passengers real lumbar support on longer runs — relevant as 2026 LSV use shifts from occasional golf-course duty to daily multi-passenger transport.

Fire Safety and Cold Weather

The foam uses non-halogenated phosphorus-based flame retardants, following the 2026 industry move away from brominated and chlorinated chemistries that face rising EPA scrutiny under TSCA Section 6. Burn performance meets FMVSS 302 (49 CFR §571.302) at ≤4 in/min horizontal spread per SAE J369.

The vinyl is cold-crack rated to −20°F per ASTM D1790, so it stays pliable through winter storage in Northeast and Midwest markets where 2026 Valor models sell through dealer networks.

Technical Specification Matrix

Every value below is tied to its published test standard.

Moisture Pathways and Controller DTCs

Cushions are passive parts. They never generate Diagnostic Trouble Codes on their own, and they cannot interfere with the 2026 CAN-bus 3.0 architecture, Curtis 1268/1234SE controllers or IntelliBrake®.

But a torn cushion creates a secondary problem. Water runs through cracked vinyl into the under-seat electrical compartment on TXT and RXV 48V platforms. That moisture shows up as controller faults that look electrical but trace back to the seat:

• DTC 1-6 — Battery Undervoltage
• DTC 1-7 — Controller Severe Undervoltage
• DTC 2-2 — Controller Overtemp Cutback
• DTC 2-3 — Undervoltage Cutback
• DTC 5-5 — Throttle Wiper Fault

If you keep clearing undervoltage codes while the rear seat is visibly cracked, inspect both systems. The closed-cell PE barrier in this set cuts the moisture pathway to the electronics bay, reducing secondary DTC risk by an estimated 60–70% in high-humidity or frequent-wash environments.

Street-Legal LSV Use: Seating and Belts

Under FMVSS 500 (49 CFR §571.500), a Low-Speed Vehicle must provide designated seating positions with Type 1 or Type 2 seat belt assemblies per FMVSS 209. On a converted TXT or Valor, the rear flip seat needs DOT-approved lap belts anchored to the seat frame or vehicle structure.

This cushion set includes molded pass-through channels compatible with standard 2-point belt mounting. The belt assemblies themselves are not included — you supply FMVSS 209-compliant belts.

Enforcement tightened for 2026: as of July 1, municipalities including California and Florida require children under 12 to wear seat belts on all golf cart seating positions on public roads. California (CVC §21260), Florida and Texas enforce LSV rear-seat restraint requirements effective 2026. Road use stresses the whole vehicle, so tire condition matters too — see 2024's Best Selling Tires Ranked by Performance and Safety for how popular tires score on braking and safety.

Why OEM E-Z-GO Rear Vinyl Cracks in 18–24 Months

Factory TXT seat vinyl is single-layer 18–22 oz PVC with UV stabilizers rated below 500 hours of SAE J2412 exposure. In high-sun states — AZ, FL, TX, CA — that means visible cracking inside two summer seasons.

The failure mechanism is plasticizer migration: phthalate-based softening agents evaporate under thermal cycling and the vinyl turns brittle. This set counters it with 28-oz marine vinyl, polymeric non-migratory plasticizers and benzotriazole UV absorbers, extending outdoor service life to 5+ years under equivalent exposure — roughly 2× the OEM's UV degradation resistance.

Cross-Reference: What This Set Replaces

Match your existing flip-seat kit against these SKUs:

• GTW — 01-230, 01-231 and 01-232 universal seat kit cushions
• MadJax — Genesis 250 and Genesis 300 standard cushions
• Buggies Unlimited — SEAT-610U universal board kits

If any of those cushions are worn out, the KOEEP #4013 set is the direct-fit replacement across the full TXT, RXV, ST, ST Sport, Valor and MPT range.

Frequently Asked Questions

Order the Set or Talk to a Parts Specialist