Our GMC Acadia requires the 50A fuse (along with some other smaller fuses) to be removed when towed on four wheels. It comes with that amp fuse, just in a shorter body. This larger one fits in the underhood fuse box, and since it's larger than the others, it's easy to tell which one to pull. It can be removed with your fingers as it also sits higher than the rest. We will fit the derailleur over time but for now it is an inexpensive solution that will make it quicker and easier to hook up the car and get it ready for towing .