Hey all! Hope everyone has a great Easter weekend!

Okay, here is my problem. I have a custom intercooler core, 1.75" thick. Unfortunately Mcmaster Carr has bolts available in 10mm increments when you get to the longer lengths. The shorter bolt is just a hair to small, but I have a feeling the longer one will be much to big. Also, some of the bolts I think are bottoming out in the LIM thread....how can I tell if this is happening?

So my question is, should I buy the longer bolts and cut them to size? Will that hurt the integrity of the bolt?

Or can I have bolts custom fabbed for me? If I'm going to have them custom made, what is the best way to measure for them? Does anyone have a good place to do so?