Just a note regarding the spacers to fill the gap when installing R200 ring gear with 12mm through hole and using the 10mm bolts. Give Precision gear a call, as I did, and they will tell you they are not necessary and have customers who race off road who have no issues by not using these spacers. Basically, if you are worried about the ring gear slipping against the LSD carrier, them you have not torqued the bolts properly. Also, if by chance you fabricate spacers that happen to be a tiny bit too long, the bolts will not clap the ring gear properly and you WILL then have a problem. Don't trust my post, call Precision Gear! I've got one of their R200 LSD and it works perfectly and it cost under $500.00.