#4 in the diagram is the piece. I will be picking it up from an indy close by its about $80. That piece goes into the expansion tank on the bottom. I am assuming I have to get the old one out with some clips holding it and then nicely place the tank over it. I have not messed with it yet but I think it should be some clips around it to take it off.





**** edit - also out of curiosity when I was removing the expansion tank the silver box connecting the oil cooler pipes got loose and leaked coolant but that was during draining process anyway so it was not a problem but does it just hang on to it because there was nothing locking it into place.

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TITANIUM SILVER METALLIC
2004 E53 3.0I M54 3.0L
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