Sennheiser PC 131
I've got a set of the above, and they're a cracking little set of headphones. I've had them a few years now, and the 'Acoustical foam ear cushions' have torn and worn away leaving the plastic touching my ears.
I've had a quick look around and can't seem to find anywhere that sells the little foam pads separately. When I had a set of Sony heaphones about 7 years ago, they had a 3rd party seller that would sell a set of foam pads for about £2 including delivery.
Any suggestions?