Don't laugh but if color doesn't matter I have found some powder
puff (cosmetic) pads can be a perfect fit, cheap and some are
cotton pile,so far better than foam.
I use different grades of black foam(though color really isn't
important.) and have various tools to cut and shape it
Also use sheet vinyl and poly for some with foam glued onto it.
(the pad types that have the vinyl cloth that slips over the outer
ring on the transducer body.)
I use xacto knives and the circular "cookie cutter" style cutters
found in gasket cutter kits.
The best glue for those pads that require glueing to the vinyl is
Scotch 77 commercial spray adhesive.
I've even used thin glove leather for some of the older phones I've
repadded.
With a little effort and ingenuity one can usually have better pads
than the oem that they came with.
