I know it late but I just joined the site. Here is a link to sennheiser. I buy mine from them every few years.       http://www.sennheiserusa.com/serviceandsupport_part-finder  

I know it is a little late to reply to this but I still have my 2+2's and the manual, every once in a while I take them out and they sound as good as when I bought them. I had to take the controller apart and clean the contacts and replace the cushions. Koss sent me some a few years ago that I...