I can't help you there, if you were closer to Canada I would take a look at
Gary Leden's yard.
Somewhere in the forum, a few month's ago, they talked about another "stovelbolt heaven" further south in the States, that might be a good start. GMCPaul might also be able to get you a few things, he is a member here, but runs his own website with parts for sale. Google for GMCPaul and you'll get there.
Good hunting
Richard