Rich, maybe you and I should swoop in on Marc's place and have a 915 tranny party at his Garage & Grill.
BTW, I bought SSI heat exchangers from MM. They were new in the box and the price was the best I could find anywhere. I would buy parts from them again, as long as they are OEM or respected name brands. But, as you can see from my engine rebuilding thread, I wouldn't send them my engine to rebuild. Way too many bad stories for me to chance it, though some (one preson that I'm aware of) have had good results.