The rag joint is just a standard Ford rag joint. We don't stock them but you should be able to find them at a local parts store. I've found them before in the "HELP!" section where they have door handles, window cranks, and other bits and pieces.
As for the quick release, we use a standard GM 3-bolt hub so the racing quick release units such as what speedway (
www.speedwaymotors.com) work great.
Dana