On my, now sold, 92 300SE I had both of my rear regulators go sour also. On the previous large car, the 126 model, you could buy just the 'jaw' to fix the assembly but not on the 140. Now you have to purchase the assembly. I put mine in with a 3/16" grade #8 aircraft bolt instead of the rivet so in case it needed another, easy to do! Got smart and sold it before the time came!