hi guys, going to be giving my front and rear pads and disc a change this week. went to my local car store to get a piston rewind tool for the rear brakes. the lad in the counter says he had one but it's only for a C5 which is pointless for me. so rang up another store 10miles away he says they have one and it fits subaru and vw and volvo etc... he sounded kinda unsure. so is there any ways i could tell when i drive up and buy it 2moro.