Tell them you got in an accident and the old mounts broke and you need to replace them.
Don't e-mail them, call them Direct. If they say no, tell them you'll never buy their product again an you'll bash them on the internet. You words like customer service and Better Buisness Bueru...
They'll comprimise...it's no skin off thier butts to sell you the parts seperately.
If not, try BDS or Boondox, or even that dude of the internet that sells the over priced budget boost. someone will sell them to. you