I'm wondering what holds the chrome trim ring in place (# 20 in attached diagram) on the front forks of a 1970 CB 750? This ring is located just below the headlamp bracket. Parts diagram seems to show rubber donut (part #22 in diagram) just above, but I believe that goes inside the lower part of the headlamp bracket to provide a cushion for the bracket against the lower tripple tree. Thanks in advance!