Add to that advertising. The 2+2 owners aren't going to just psychically know these parts are now available. All that and how long would it take to sell those 100 parts. I think it's unlikely they'd ever even sell all 100.
Maybe if Beau M did all the leg work and found enough people that wanted these parts, went to Tabco with cash in hand they'd be open to manufacturing the parts. If they were guaranteed to sell 50 of them they might think the investment would be worth running the parts. That's actually a good idea for anyone who thinks "they (meaning someone other than me) should make XXX for my car. I know lots of people who would buy that for $XXX". Sounds kind of like the start of a business case actually. One could become a broker and drum up demand and money and take that to part manufacturers and get the parts made. Take a small percentage of the total sale for yourself and everyone is happy.
Steve