Clarification please: are you looking for a seat for an XT225 or an XT250? Are they interchangeable?
If so, a few years ago, I got a Seat Concepts seat for my 2006 XT225. Being a packrat, I never got rid of the OEM seat foam (the pan was used for the SC upgrade) "just in case" I ever wanted to experiment with widening/dishing it. The foam is yours for the cost of shipping from Georgia to Maryland. E-mail me at email@example.com if you want to move on this.