I'd understand how some people might get creeped-out by something like that. Maybe you can send a short email or letter with a picture of the car, and leave it at that. Give them the option to contact you, if they want to take it any further.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma