I have bought some 288mm vectra front disks and calipers for a brake conversion. Has anybody done this conversion? Do the calipers bolt straight on or do I need conversion brackets to get the caliper in the right place? I can re-drill the five stud discs to the four stud pattern no problem, however the ones you can buy have a special collet fitted in the centre hole so they are a snug fit on the drive flange does anybody know what to use for this? Are they made up on a lathe? Can anybody sell me some?