OK, I found the 1957 TDB.

I'll keep adding info here.

Interesting, the pickup floor/bed wood is "seasoned hardwood".

RPO 431 Custom Cab
includes bright metal windshield and side window reveals, and ventipane frame, two-tone nylon and vinyl seat fabrics, cigarette lighter, chrome-plated control knobs, dual sunshades, driver's arm rest, foam rubber seat and and backrest cushion. Series 3000 models also include chrome-plated grill, hub caps, headlamp bezel, and front bumper.



I think there might also have been a DeLuxe Cab but I cannot find it. Does anyone know the RPO# for it (if it was available)?

Last edited by tclederman; 05/28/2017 1:05 PM. Reason: added info