Hi Red98, thank you for the information mate worked a treat use the air gun to pop the pistons out no issues at all just need to change the seals and will go about fitting the new set on the bike, I was really lucky to find it by setting an alert on Ebay just popped up I jumped straight onto it!!! I have attached some pics of the 600 caliper for you to have a look at if you are interested as I say just missing the seals and pads as I was to replace them.