Hey JB, I ended up using the GM Synchromesh part #12345349 per the Tremec installation tips doc that came with my trans. I picked it up from the local GM dealership. Interestingly, in the Maintenance section of the instructions it states "Recommended oil change intervals should be based on specific usage. In most cases a "fill for life" is adequate, while in severe applications such as drag racing or road racing a more frequent oil change should be prescribed." I tend to be overly cautious with these types of things and will likely drain and replace after the 500 mile break-in period.

Look forward to seeing your first start video!