I bought mine from Gary Bufkin at Aero Supply in Texas.
A Ha!!! A personal friend, and none finer. He's also in the process of restoring two Luscombes. His company supplied the refreshments at the last IA renewal seminar, as well. So, buy his stuff...and I'll have nice treats at the next one, too.
Aero Parts & Supply (214) 337-3328. Tell 'em I sent ya, and you'll have to pay a tolerance fee. So, mum's the word!