"If someone has a stock Advance Design short bed that originally came with the spare carrier, could you measure where the bolt holes should be drilled for me?"
I have two 1954 1/2 Chevrolet trucks with what I think are original/stock spare tire carriers, but my reference points for the measurements would not help you (the beds are different).
If you are looking for a stock/original set-up with a bed like yours, you want a measurement from a 1953 3100 (for 52 Chebby's 1952 3100) or from a 1953 3600 (for Denny's 1950 3600).
Have you checked in the gallery - maybe send a message to someone with that setup?