They need to be sent away. There is a main dealer for d2 in england somewhere but I can't think of the name. I had to get mine sent away when the top mounts went. How long have u had them, and did u get them new ?
I've been looking I can't find info anywhere.. I've had them a little while I got them second hand they're roughly 2-3 years old but in decent shape so don't wont to replace yet