Is the 63 same as 65 as far as torsion bars? I use a 1.12" on the RF and a .99" on the LF. I would use the biggest one you have on the RF and maybe one size smaller on LF. If you don't have at least a 1" or bigger for RF i would put a new Lower control arm rubber bump stop in there because it will ride on it especially on a rough track. remove the upper bumpers both sides.