darn it my log in did not work when i wrote this book for the first time--here goes again--66 discs will bolt right up to 62--must use 66 spindles and maybe tierod ends--also get the proportioning valve on the frame or a new adjustable valve--large disc master cylinder as on 66 or dual master needed as well---only downside is if you want to stainless steel sleeve the calipers -it runs about 600.00 for the pair--for that money master-power brakes will sell new calipers/discs/etc that will bolt onto 62 spindles--my next brake swap will be these type (66 disc) onto my 61--i think i am going to forego the stainless sleeve route and just bead blast/powdercoat/rebuild the calipers--rebuild stuff readily available--my 57,63,66 galaxies all have this disc set up and it is a definite improvement