It does appear to be the AMG 2nd generation aero kit. The molded in logo on the left side of the ducktail spoiler would be correct. The /// would not be period correct for AMG as that was a later logo and only appeared on badges. My concern would be that the kit was not available in 1985 and it's obvious that it was added some years later since there were no AMG kits for the 190E with the lower body cladding until later.

The real test would be to inspect the pieces for the HWA numbers molded on the inside portions of the urethane plastic, not fiberglass, body kit pieces.