Nice trucks guys!
I have a 40 Chevy also.
I was doing some research and came up with this seat that might work good in our trucks.
I e-mailed them and they also sell extra material to match the seats so we can do the headliner, door panels, kick panels, etc. with.
I haven't measured my cab yet, but I think the 52" seat might work.
There here, http://www.discountvantruck.com/truc...braLowback.htm