Seat override (SEO)

Years 2001, 2023, 2025–27 Models 4 Factory citations 7

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Also described as Seats, front Custom Cloth buckets with vinyl rear seats, fleet option

Also documented for Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2023, 2025–2027 Factory-verified

the 2023 Upfitter list reads Seat Override (SEO); O: Passenger TG33706; not offered: Passenger 1LT, Passenger TG23406, Passenger TG33406; in the 2025–2027 guides only in the Passenger guides

GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.
GM factory document — 2025 gmc savana passenger fleet order guide, p.29.
GM factory document — 2026 gmc savana passenger fleet order guide, p.31.
GM factory document — 2027 gmc savana passenger fleet order guide, p.29.

Sierra — GMT800 (1999–2007)

2001 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2001 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Yukon — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of 5T5 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.