Required when installing a Scorpion Lock-up clutch in 2015 FLHTCUL and FLHTKL Big Twins and all 2016-19 FL's using the OE derby cover. Includes billet aluminum spacer plate, O-ring and chrome Torx fasteners. This spacer is NOT required if using Barnett clear derby cover 1107-0540 or 1107-0541Barnett Derby Cover Spacer.