I have a 1985 mercedes 190E 2.3 liter. When we got the car, it had unexplained self acceleration above 20 mph which stopped on the slightest tap of the brake. We traced it to a cruise control problem. Interestingly enough, the cruious control control arm was missing and was stuck in an/accelerate mode. We stuck a hex key into the slot and turned it off.

Does anybody know if this is an individual part (i.e., i can go to a junk yard and pull a replacement) or is it part of a larger assembly that may require more work?