which rotors on 944 brake install

[bulliporker]

i have cb dropped spindles, 944 hubs, 968 brembo calipers, done all the work on spindles ie bearing spacers caliper, centralising shims , but not shure what discs to use have mocked up with early 944 rotors 21mm x282mm but been told they are to narrow as could have problems, with pistons popping out of caliper when discs and pads wear down, been told use the 911sc and supersport disc 282mm x24mm is this a straight fit, is this the same as 944 turbo 1986 year only disc, also been told to use the anti sqeal shims , and use an old set of pads behind new pads to make up the difference , when pads wear, is this correct any help appreciated, as this is only thing stopping me fitting my new porsche wheels and brakes any help appreciated