10 mm bolt 12 mm spacer for r200 clsd 3:36 ring

The clsd carrier is out of an 89 300z Turbo. The bolts are 12mm. However the ring gear is a 3:36 ring with 10mm bolts holding the carrier. Rather than drill and tap the ring gear, I purchased from a member a set of stainless steel spacers. A tube 10mm inside and 12 mm outside. They are each cut just short of the depth of the ring gear and is a sanitary way to use a 10mm bolt through a 12 mm hole. There are some that maintain this is unnecessary because the carrier can be "clocked" over to make contact with the 10mm bolt. I prefer this way.