The team.net webring and mailing list were awfully good to me when I restored my sprite:
The Triumph Home Page
For parts, keep in mind World Wide Auto Parts in Madison WI, he is known around the nation for Brit parts. Owners name is Peter Caldwell, super guy once you get to know him. If the TR6 has lever action shocks, and I believe it does, and you need them, Peter is your guy.
http://www.nosimport.com/