I've got a pretty nice Sheel seat. It is used & has a few wear holes on the drivers outside bolster. It does have the the seat runners on it. So it will go right into your 914. I used it off & on the last few years. Definately keeps your butt in the seat. I liked it for autoxing & longer trips. For around town getting in & out alot I like the stock seat better. $250 plus shipping
I had a few questions. The seat frame looks to be made of metal & not fiberglass. I'm adding a picture of the frame or as much as you can see from the small wear hole on the back of the seat. Hope that helps