Even if there is anywhere that essays for Opel are here! In my Opel Astra G 1.6 55KW was no suitable attachment while turning back to the 34mm brake pistons! One is in the process of grade so fit, but from time to time slips, because he is a little too big!
It works, but you should be careful that you do not return the piston rotates too far, so that the Remains dust cuff healing!