I want to change the oil and wonder if i can get the orings for the oil plugs and the ring for the derby cover. I don't know the part#s and wonder if these could be had via the internet/ebay. Want to save a trip to the dealer. Also, I have read posts with concerns of inner bearing failures. I have an 06 custom with 13k good mi.; made 2 trips to Sturgis without diff. I had to sign the paper at purchase stating they would take my bike at 15k, tear down the trans, and inspect the bearing. Later, I received a letter via HD saying the bearing was going to be ok and that service was not needed. So what gives..? My trans sounds normal and bike is unmodified. I use 140syn in the gearbox and mobil 1 10-30 in the primary. Tahnks!!