Z3 2.8 Expansion tank hose to engine block
I have a 2000 (production date 6/1999) Z3 2.8 roadster. I am trying to get the part number for the hose between the expansion tank and the engine block. The expansion tank looks like:
I am looking for the hose which connects on the left side. If you look at a parts diagram for this expansion tank you see something like:
and it might seem that what I am looking for is number 4 in this diagram. But that item (part number 11531436122) is actually a long hose which connects the front of the expansion tank to the radiator. I know it seems like in the picture that it connects to the left rear of the tank, but it doesn't. Nowhere have I been able to find a picture and part number of the hose which goes from the left side to the engine block. Here is a picture of that hose on my car (I draped a little black piece of plastic around it so as to identify it):
You would think all I would have to do is go to a BMW dealership and ask them. But they bring up the same diagram. Part of the problem is that their parts list for this car specifies an updated expansion tank and the parts list indicates a water hose is required to use with this new expansion tank. So the parts manager assumes that is the hose I am looking for. But it looks nothing like what I have. It looks like a big U:
It is part number 11537505831 and is about 5" x 7".
Does anyone know the part number of the hose I need, or a picture which shows this hose leaving the expansion tank?