an interesting thing about Guzzi rear drive boxes, there is a breaker, Suncoast cycles that has a couple of rear drive boxes on ebay. They do not have the pinions with them so I emailed them and said they are basically worthless as the pinions and boxes are a matched set. He said sadly no he could not match them. Its too bad, I hate to see good parts go to waste. anyway the interesting part is that I asked the question thru the ebay site but under questions asked about this item it does not appear. curious