i have recentley been working on my san ready for an MOT. it has been sat through winter and not moved, i have been starting it regular to keep the engine sweet. the first time i came to move it the rear callipers were stuck on. i removed them and found that the piston was very pitted with rust and would not retract, after cleaning them up they seem ok now but i feel the callipers would benefit from new dust seals to make sure this does not happen again. has anyone else had this problem, can i get the seals somewhere off the market?