101 Octane Bolt Set forQMB139 50cc Engines. Includes CVT cover bolts, cylinder studs, oil drain plug and much more! A handy set to have when rebuilding your engine. Please Note: These kits come with assorted hardware and the photo is an example of the contents of this kit. The kits come with either all silver color hardware or a combination of gold zinc coating and black. We do not have a choice in which color the manufacturer sends to us.