Terry Hendrix was one of the first to even recognize the advantages of a 245mm converter.
His commitment to quality is unsurpassed. (this is evident buy their 5 year unconditional warranty) Although I will not tell you Ive never had problems with precision converters over the 20 or so years Ive purchased from them, I have had a few that did not perform correctly out of the box.
They also sell "kits" to rebuilders, that include their billet cover.
I'm not certain, but Yanks covers appear 100% identical, if he does not buy them from precision he copied them nearly exact.
I tried several times to talk to the owner of yank, asking technical questions, and did not get a answer but rather a defensive and insulting attitude.
I never called back again. (keep in mind, I spend a very large amount of money yearly on performance converters for my customers)