Dan Smith of the m-100 pages has mentioned that persons have been able to get the coveted 15-inch steel wheels from m/b which are a perfect match for 108/109/113 applications where 14's were standard. With 15's, many more tire options are available.

MB parts # is/was 126 400 28 02 and labeled "Disc Wheel". Try your local dealer or mbclassic and let us know if any turn up.

edit -- mbzstore.com has these 15" wheels for $155/per, special order only. 15-inch hubcaps might take a little more doing but ARE out there.