Wheelman,
The ring gear bolt spacer issue has been discussed in depth previously however, when I purchased my LSD from Precision Gear I asked them what they recommend and what they do....Precision Gear has been building LSD diff's for on and off-road racing successfully for many years. What they told me was......"You do not need the spacers. We've installed many of these type differentials without using spacers, with great success. Ring gears are secured by the the torque of the bolts. When properly toqued, the ring gear will not move." I followed their advise! Think about it, if you make spacers and they are a shade too long, they will prevent proper torque on the ring gear....hmmmmm! If you make spacers that are of the proper length, then they will just float in place....doing nothing! Again, I followed the tried and true advise of certified proffesionals.....you make the call!!!
Tom