Wanting to put 1" Delrin mirror extenders on my bike but don't know where to place the stock rubber 'gasket' that's glued to the back of the mirror mount. Should they go between the new extender and the bodywork or leave them on the mirrors and place them between the mirror and the extender? I assume they're (mostly) meant to reduce vibes but in looking at the fragile bodywork around the bolt holes, I'm wondering if maybe they should go between the bodywork and the extender. Whaddyathink????