http://www.stovebolt.com/gallery/garrett_pee_wee_1958.html

This guy knows quite a bit about those trucks and has discussed upholstery before on here.
Also SMS Fabric has the upholstery and may have headliner material. They are pretty resourceful people. They take their time, but when you get the right stuff, what was time anyway?

http://www.smsautofabrics.com/