I was washing the bike when I found that the rear bumper was broken. The piece was probably cracked a couple of years ago when I was hit from behind while sitting a stoplight by a homeless cranker. He had been living in his car and had deferred out the brake maintenance in favor of his favorite recreational substance. No license, no brakes, no insurance, no problem.
After the crash, I replaced the rear fender and a few other parts but not the rear bumper. When I found the bumper had finally broken, I called my local HD dealer and ordered the part. The part was $117 and would arrive in about 5 days.