Antenna Rubber Grommet

When I took my 560SL in for service last month the manager pointed out I was missing the rubber grommet for the antenna mast. I never noticed it missing - quick easy fix - around $10 on eBay, remove the antenna from the trunk (boot), soapy water on grommet and push in - reinstall antenna. Thought I would share in case anyone else never noticed - I went back and looked at photos from last year and sure enough there was no grommet - how in the world did I miss that?