I would like all the items also. Starting with the decal. About the same size as the MBCA decal would be good. As far as a common area to place it, how about lower left corner of windshield, by state insp. stickers. Right now this is where I have my MBCA decal. I also like the idea of coveralls. Pictures of said products would be helpful of course.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member