With the information/pictures provided? I would ask $5,000.00 for the car. The wheels are not original - this doesn't help a vintage Mercedes-Benz garner large dollars. It also looks raised? Rather odd for a car of that vintage, IMO. Again, this will not help a vintage purest sale part with above average dollars.......

EBay would be the place to potentially garner more - provided you have expectations on getting over that number, and can provide a lot more pics, AND records/history on the car.......

It's not a "$15K to $20K" car as shown, by any stretch of today's pricing, IMEO.