I used a '95 Ford Lariat F150 bench seat in my '62 c-10. They are pretty cheap at a pick and pull, and sometimes you can even find one that has been recovered in the color you want. The Ford seat is all foam on the inside and there are plenty of foam replacements if needed. Fits like it should be there. I also have an in cab gas tank, but I changed the steering column and went to a smaller steering wheel. If you opt for a smaller steering wheel, you will probably need power steering.
