Bean and Kip, sports & classics has a few bits, British miles is another source for odds and ends. Not sure if Snyder's is still around.
Networking is the key. The stuff is around. Keep an eye on ebay, too.
If you have a hard time finding specific bits, let me know. I have a small network of Morgan friends who hoard 100E bits they find at swap meets and love to help others with their projects.
BTW, I saw a company in england who's reproducing the aquaplane stuff!!!!!