As far as I know the under bed part is not reproduced, but you can usually find used ones still.

Here are some photos of the one on my '65 c10:

09/25/2006 : 16 pics — under bed spare tire set up



07/30/2017 — under the bed spare tire holder

I took out the plastic piece in the part that secures the wheel and had some nuts welded on each end of the correct thread. That plastic piece had a habit of breaking, which is why you don't see a lot of the trucks with it still on the truck.. that or some later model exhaust routing put the tire in the way.

Used Parts:

One of the best places to look for used parts is here on stovebolt.com:

Swap Meet area of Stovebolt.com

Look under parts for sale or place an ad in Truck parts wanted.



More used chevy truck parts searching tips:

An article about searching for used pre-1973 Chevy/GMC Truck parts.



Enjoy, good luck.

-Woog