I recently aligned my car including successfully setting the frt bump steer. Using a 1 inch steel spacer as I have read in some posts got me within .05 of a degree in the frt. The rear is a different story. My car does have the the double shear set up. The car came with a longer lower spacer and a shorter upper spacer. The angle at ride height was way off from the rear lower control arm. I want to at least get it close in order to drive the car to a racecar alignment shop. I swapped the spacers and it was closer but still over a degree off. What type of spacer lengths has anyone used in the rear? Thanks