You have to trim it down to size... I held it next the one off my trx ignition and marked it with an ink pen then used a bench grinder taking it nice slow until I had a nice tight fit! Then used a dremel with a cutting wheel to cut the groove into the front side. Be patient and take your time it's very crucial that you don't hit the wire and that you get it to fit as tight as possible to keep water and debri out......it's really not all that hard to do once you get started
