new behr radiator

[adamkat22]

i just got a replacement radiator for my '77 240D. The one I got is a Behr Radiator but it looks different than the Behr currently in my car, so i'm confused on replacing it. I think I just need a little orientation to the whole radiator scene...

First off, on the driver side of my current radiator there is an aluminum strip about 3" wide running top to bottom with two lines at the bottom of it. Thats the oil cooler I'm assuming? Is that part of my radiator or its own unit that will snap on/off?

On the new radiator I have two smaller brass fittings on the bottom left and right side (AC I'm assuming?). Then the very bottom has a drain plug, and then something that looks like a plug but doesn't open and I'm unclear of its function.

So....my questions are:
1) My AC was cut out some time ago. Will I need to cap the brass AC fittings somehow before filling with coolant? Can't tell if they are sealed internally.
2)Assuming oil cooler is a seperate unit then is it just as easy as draining the old radiator, disconnecting the big hoses and throwing the new one in place?

Thanks for any help!