The mounts are different!
The short bed mount sits higher.The longbed mount sits lower and the cutout in the fender is lower too and farther forward.
The braces for the mounts are at a different angle too.
They won't interchange.
Maybe someone has pics of both for comparison.
Here's a thread from the 60/66 forum about these spare tire mounts.
http://67-72chevytrucks.com/vboard/s...re+tire+mounts
Mike.
