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AWAP - not so sure about the availability of BA/109 parts. Do you have a source for diaphragm covers? VDH is out.
I have not gone looking for covers in quite some time. Scubapro seems to run another production batch every once in a while when demand climbs. I used to have fairly good luck getting them from shops that had built up a small stock. It did involve lots of phone calls and patience. The key to success with those older regs is to have enough of them in the line-up to ba able to wait for parts to become available. In a pinch, I have had fairly good results with "painting" rubber parts like covers and exhaust-Ts with neoprene cement to extend their life a bit when they start cracking. Hopefully VDH will consider another run.