I need to replace my water pump on my '88 260e. I am pretty positive that is whats leaking. It only leaks when I shut the car off. My problem is I need the engine number to order the right pump. Can someone point me in the right direction ? Somebody told me it was on the engine block or cylinder head. I just can't find it... Thanks Jim

I is on the engine block on the side at the bottom below the exhaust manifolds toward the front. There is a boss in the side of the block and it is stamped onto there.