If your existing winch has a Hellfire Gearset fitted and you are upgrading to a 2 Speed gear set in your GP100 or GP50 top housing you will need this gear to keep your Hellfire gear set.

Note -  This adapter will only work with the 2 Speed gear set and NOT the older single speed top housing gears. 
It will not fit or work if you do not already have the rest of the Hellfire Gear Set fitted to your winch.