vr6gordy...
Is it the brackets or the collars that need replacing? I just put a RS4 RARB on mine because the collars had worn away to nothing, these are part of the RARB so you need to buy a new one....
If it is just the mounting brackets, they can be bought separately along with the rubber bushes, I can get you the part numbers if required...
I paid roughly £130 for the RS4 RARB, 2 bushes, 2 mounting brackets and 2 drop links from my dealer, absolutely worth every penny and not much more expensive than a standard one....