It's been a while but after reading this thread, I swapped in used MBZ diaphragms for the dual piston pods. I couldn't help it. I'm cheap, new pods were ~$70 each, the pods can be accessed without much trouble and I have bigger climate issues than a semi working vac pod. Thus, a half fast attempt at a cheap repair was better than an expensive(er) repair. The pods hold vac and seem to be redirecting the air flow.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.