Yes, that's the one.I have come to find , all along that was my problem with the sluggish delayed response.I have played with it many times.At this point I just want to change it.Facing the car, and I hold it's body on the far left and the rpm changes.Ready to order one from a junkayrd.Found one on the net which looks just like mine.it was listed for the SL,129,w140 etc.....I just want to make sure it's the same part.I could also buy this repair kit but at this point I just want to replace it.