Sounds great guys. Thank you very much for the input and for the measurements. If the forearms are 13.5, I should not have to shim too much.
The problem with my current forearm pieces is that they are shimmed and still will not fit correctly. I know that heating with a heat gun and reshaping may help, but I am not sure how to do that. More research needed!
Eric, the shimming method you mentioned sounds like a good idea. Hopefully, I will hear back from Rob soon.
Cheers!