I'm sure foam rubber is readily available, maybe you could just liberate some from a trash-bound couch cushion, it'll just have to be cut to shape. The foam from my parts unit is okay but I'll have to cut new stuff eventually.
It's kind of like what happened to a lot of 8-track tapes; most foam pressure pads rotted and fell apart whereas some are still as good as new. Those could be made of Polyurethane foam, that's what's in my chair anyway and it's getting along in years and holding up fine.
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