Interesting find today. I had someone suggest I needed to add a bushing between the transmission and crossmember. Well, nothing fits, so I had to do some research and figure out a custom solution. Turns out there is a specific durometer that trans isolators are made of....70A. If you wanted to check which energy suspension part has the correct durometer, this was a neat site...
http://www.suspension.com/universal-isolators.asp
I ordered
9.9528... they are 2 1/4" pucks 1/2" thick. I figure I could stack them if needed. Speaking of pucks, I did get a suggestion to use old hockey pucks. There were mixed reviews on if those work or not. I decided to get a few just as extra height on the cab mounts where needed.
Quick update: The 2 1/4" pucks are an awesome size for shimming and shock mounts. Very pleased with the purchase and can't go wrong with $20.