Double check on the double check Scott. I know what you mean cousin, I have gotten parts with the wrong threads for the hardware. LOOKIN Pretty sharp so far.
There are 2 pistons per caliper, I just found some new calipers on ebay for £20 more than seals and pistons, (piston are knackered as well) Regarding the safety, the cars for the Mrs, so i'd better get it right!!