The 3D printers have taken over much of the business. After the cost of the printer, the parts can be made on demand. There is less stock to keep on hand, less waste and parts can be modified in the necessary programs supporting the printer. I was a resin caster too and have switched to printing. I'm sure the parts you need are still available somewhere.
If the red is the problem, you might consider covering it with color marker to save it. An orange will give you richer color and a red will give you deeper, darker color.
Hmmmmm, let me see, imports.... I have a vintage Jag racecar, a 49 Anglia, a Volkswagon squareback, a Fiat Topolino and a Ferrari 250 GTO. If someone wants to buy the print file, some are over $350, I would gladly print all the parts at cost plus.