That's different. You didn't say 4matic the first time.

The 1993 300E 4matic has the 3.0 liter m103 engine. It will have a cruise actuator, as the m103 does not use the electronic drive-by-wire throttle like the m104. I don't know the m103 engine, so can't describe the cruise actuator to you. It should be simple to locate. Find the throttle cable under the hood, follow it to the end. That's the throttle body. The cruise actuator is going to be some type of mechanical linkage which moves the throttle body. Typically it's a short metal rod which connects back to a silver box about the size of a pack of cigarettes. The silver box is the cruise actuator.

- JimY