Now '89 version may be different than say '90 version. '90 and later M103 engines have the single plastic cover over the plug wires. One of the most stupid designs I have ever seen. I've had two of them and there is no way to really get the blasted thing to stay in place. I have bought new ones and they don't work. Depends on little plastic tits on the sides that are supposed to fit snugly but don't.

Steve