This dual-circuit master cylinder is for use with 4-bolt disc brake conversion kits. It's designed to perform well and give good pedal feel when used with disc brake kits. It physically fits on early models, but the reservoir plumbing may need to be modified to use an early style reservoir. Due to the placement of the connections, right-hand-drive applications may have some trouble getting everything to fit. These have plugs inserted at the time of manufacture to keep any foreign debris from going where it doesn't belong.