The Stovebolt Site Forums The Shop Area Interiors bench seat question

I just bought over the weekend a 1957 GMC truck with a 1959 fleetside bed. It was a started project that the person didn't have time for anymore and it came with tons of misc. stuff. Among that stuff is a bench seat that is obviously out of a car. After further inspection it has a nicer plastic back with an ash tray that flips out in the middle. Could anyone tell me what car it may have came out of? (I know I'm not giving you a lot!) It's width is perfect for the truck but it wasn't bolted down or anything. Could it be out of a tri-five car? And is it common to adapt an older car bench like this to a truck or should I just try and find a truck seat?
Thanks.

A picture speaks a thousand words. When you get a chance, post a link to the pic. I'm sure someone will be able to identify it or at least venture a good guess.

+1 on the picture! Is the seat you have a split bench or is the back 1 piece? Is it hinged at all? Just maybe something you want to consider if you want to be able to get behind the seat easily. When adapting car seats to trucks it's best if you can get the mounts off an original seat to adapt to your new one. It makes bolting it in that much easier!