After receiving the replacement part from this site, I replaced it last weekend. The procedures and advise really made the job very straightforward. When I removed the part, one of the ears broke off inside the radiator as I was prying it out. Luckily, my finger was under the close 10mm wrench to catch it and was able to slide it out. Besides leaving the expansion tank cap loose, I turned on the defroster for maximum heat to circulate the coolant into the system. All good and no more leaks!!! Again, Thanks everyone!

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI