Randakk's is a great bet for the earlier wings, 1000's and 1100's. I don't remember if he carries stuff for later models. I bought his carb rebuild kit for my 77 GL1000. I was happy with everything from the kit to the shipping. Very reputable.
http://www.randakks.comis the address. I bought one of his kits for my GL1000 project as well as his DVD on rebuilding. Quality stuff. Also, take the time to peruse all of the info available on his site. Also quality stuff.