Note: The QUICK-LOCK Adapter Plate to fit Coocase S50 Astra Topcase, Volt Edition to SW-MOTECH Alu-Rack has been discontinued and is no longer able to be ordered.This adapter bolts directly to your SW-Motech Alu-Rack and serves as the perfect mounting surface for the Coocase S50 Astra, Volt edition. Also fits S48 luxury Coocase for all you old school riders. If you've already got an SW-Motech Alu-Rack on your bike, and you're planning on mounting a Coocase, then this is the adapter for you! This sturdy adapter eliminates the need to use other special adapters and a universal plate to mount a Coocase to the Alu-Rack. The quick-release design allows you to easily install and remove the plate from the Alu-Rack in seconds by turning the three quick-lock fasteners. Everything from hardware to electrical harness is included, no need to purchase any additional hardware.