Griffin Radiator Questions 1970 GTO

[orbital1970goat]

I just picked up a clearanced Exact Fit Radiator from Summit for my 1970 GTO project. I was wondering if someone could help me with a couple questions about it. First, there is a silver plug on the top corner. Is this a place to tap in a steam line for an ls motor, temp sensor, or what? The second question is about two threaded fittings on the side. They have some kind of nut thing around them. It looks like two additional taps? Is this something Griffin would have done or is this a modification by someone? Any idea what the purpose of them would be? I have attached a couple photos.



Thanks for any help.