W124 AC Condenser Mount Grommet

This is a direct replacement for MB part number A2019970381 "Grommet: Condenser to stiffening and to front cross member" i.e. the grommet through which the bottom of the AC condenser in a W124 chassis is locked in place.

Things changed from the original:
- fewer round corners to 3D print easier
- slightly more snug fit