Greetings everyone I have done a search on this topic but could not find the answer I am looking for. I have a 04 s4r that had its 12k service done and the belts should have been changed. The part # on the parts break down shows 73740103b but they charged me for 73710101a. When I question this they told me it had been superseded to the new part # which was Kevlar reinforced, I remember reading some were about this. Anyway I have my covers off inspecting things and I have found that the part# on the belt is the # the break down calls for NOT what they charged me for. What is what? Did I get ripped off again? a once again disgruntled Dan.