However, the pistons are harder to get, Rock auto do them but stock varies and the want idiotic amounts to ship them. www.rockauto.com
http://www.calipersonline.com/ do rebuilt units but then you get the problem of sending over the old units as exchange plus the duty etc. I've got spare cores so we might be able to sort something with sending two pairs over, but I still don't think the sums work out reasonable.
Trev on here offered to make some stainless pistons for mine - when I get round to doing them (ie once the car's painted, the engine's in it etc etc

Fix them soon though, if you knacker your discs you'll be in for even more grief and expense!!