So, I picked up an expansion tank along with it's associated hoses and the larger fan shroud at the local MB wrecker today. The oil cooler looks like it will hang on the side of the new radiator in much the same way as it did the old one, but I may find otherwise this weekend. I figured I would take some cardboard and make some patterns for the brackets to hold the expansion tank and then copy them in aluminium flat stock. I'll hold these in place and drill holes and shoot the holes with a little rustoleum and bolt them down, The whole passenger side of the engine compartment is a blank slate in the 240, so I figure as long as I get the top level of the tank about where it is in a turbo and get the tank about level I should be OK. I'm still a little worried about the oil cooler. Good thing I have a couple of pickup trucks that i can get to work in if everything fails...