The stock rear fender protects the rear cylinder from wheel thrown debris, moisture, tar, etc. The OEM circuit breakers are also mounted to the stock fender. In most cases the rear fender get deep sixed. My mud guard fills both roles-debris protection and circuit breaker mounting.
It installs easily. Slide it down into position ahead of the cross bar on the seat rails. Its lips hang on the seat rails and are secured with four tie wraps (supplied). Remove the circuit breaker bracket from the stock fender and pop rivet it to the mud guard.