I was in Les Penna MC today in Bendigo, and noticed a stack of about 20 NOS genuine YAMAHA rear sprockets on the counter. They were alloy and dished, and when I asked what they were to suit Richard stated they were to suit YZ125C/X. Maybe useful info for the Yammie diehards (Pennas were long time Yamaha dealers and still have a lot of NOS parts on hand), hope this may help someone out. Ph no. for them 03 54435375.