Just thought this information might be of interest.
RA60: 300mm
MX73: 310mm
MX62: 350mm
These measurements are from the center of the ball joint to the center of the pivot point on the opposite end.
Im currently using RA60 struts and lower arms (P/S variety) in my AE86. And I have +0.4deg camber. I will be putting the MX63 arms in so I ill post the camber I will have then ;p
Also to use RA60 ball joints in the MX73/63 arms the hole needs to be reamed out with a morse tappered reamer. But the MX63 steering arms might fit and are of the P/S variety too...