Give Power Brake Exchange a call in San Jose. http://pwrbrake.com Tell them what you have and they should be able to help you. Rebuild parts are generally unavailable for the older volvos, and 9 out of 10 of the places I called couldn't rebuild or supply new even though they said they did. There area couple of places in Europe that say they can sell you a new or rebuilt unit, but they are $300+. I think I paid $175 which included a surcharge because I didn't have a matching core.