Each of the three locations uses different hardware. You'll have to buy the parts appropriate for the location you choose. Here's a link to Tremec's site for the 3550, you can navigate from there for additional info.
http://www.ttcautomotive.com/English...R-3550.asp#Car
Most online discussions I've seen regarding these parts has mentioned Forte's as the source. Also, Don Scott recommends Swaar Auto, 760-963-0352, as a reliable and economical source.