Replacement foam for headphone ear-pads?
I've a much-loved pair of old Sennheisers whose ear-pads are a little worse for wear, and I'm looking to spruce them up. Unfortunately Sennheiser don'e make replacements for them anymore, and the ear-pads are an unusual shape, so there's no apparent off-the-shelf option. I think the simplest solution is to get a couple of small sheet of ear-pad foam, and fashion some make-do ear-pads myself. I'm not too worried about how they'll look – I only use them around the house.
Anyway, my problem is getting hold of the foam material. Nowhere I've looked sells the stuff. Any suggestions where I might be able to buy some?