Hey Efren, there are a number of other rubber company's out there if you really want to pursue this. I have had good luck with Steele rubber, I worked with them and they reproduced the 63 Dart rear window rubber gasket. (a 1 year, 1 model only ) The sad part of all this is that it is easy to do, if you could just get some of these guy's to go in on it. If there is anything I can do to help, just let me know?
It is possible to cast these out of urethane, if I had a really good piece to start with.