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This is one of the few parts that nobody makes a stock style replacement for. The companies that sell A/C add on kits have made parts for this but I believe they only come as part of their kit at like $1,000+.
I've seen many for my '75 on ebay. It make take a few weeks but they consistently seem to be coming up. If you don't find one in the near future send me a PM and I can give the name of the seller I bought mine from. I've seem him list several over the last 2 months.
You may also want to check with one of the guys who buys wrecks and strips them.