Cab mount Redux

[mmiddle]

Ok, for those that know.... is it acceptable to shim the cab mounts?

I bought mine from Brothers trucks. the kit came with out spacers or instruction. I figured this is not rocket science so I installed the new mounts matching the appearance of the bushings with the location. After installing the mounts and core support bushings I went to test fit a fender.... The body is now sitting about 1 inch higher than the core support.

After some research here I found a post from several years ago detailing the correct thickness of each bushing and its location... see pic... OK. I go out to the shop and remove the D/S bushings and sure enough I had them wrong positions. Corrected this and now I only had a 3/4 inch mismatch. Better, but still way off.
So, I used some of the old washers 2 in fact for a total of 1/4 inch between the body and rear bushings. This brought the mismatch down to 1/8 inch so I placed 1/8 inch washers under the core support and bushing to correct the problem.

All of this to ask... Is it acceptable to shim as needed the body and core support bushings??? Attached is the pic I found for anyone who may need it. 1970 C/10 shorty