It took me several attempts to get the attention of some of the vendors I use. They are flooded with requests for info, DEALER price lists....People claiming to be dealers who are not etc etc...Don't give up....If they are on Facebook as a business then it's there to draw in business and make new contacts. I'm sorry I don't have any leads for you on the vulcanized rubber but I'll see what I can come up with. Your projects looks great and I'm glad you are forging ahead on it.
Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB