Unfortunately the 1990 Ford Mustang 302 will not work, since it is 3-wire O2-sensor. The W124 6-cylinder's used a 3-wire O2-sensor, your W202's use a 4-wire O2-sensor.

I have purchased a Chrysler Voyager 3.6L 4-wire BOSCH O2-sensor, but haven't spliced it into my C36 engine (it too uses the 4-wire O2 sensor), but it might be worth the try at only $45 vs. $170+ for a MB 4-wire O2-sensor.

:-) neil
1988 360TE AMG
1993 500E