The Brinn Metallic Friction Disc, BRI-71018 is a replacement part for the Brinn Original Transmission (71001 aluminum and 71010 magnesium case) and Brinn Pro 2.0 Transmission (70101).
This item is marker number 17 on the 70001 and 70010 Transmission Exploded Diagram.
This item is marker number 5 on the 70001 and 70010 Clutch Assembly Diagram.
This item is marker number 12 on the 70101 PRO 2.0 Exploded Assembly Diagram.