The oil cooler is not a part of the radiator. It must be very carefully detached from the radiator. If you can do this without detaching the oil cooler lines that is the way to go. The cooler usually has a through bolt at the bottom and slips into grooves at the top of the edge of the radiator. I repeat be very careful with the oil cooler it is very fragile.

The brass nipples on the bottom are for the automatic transmission cooler. If your car is a stick you can ignore these or plug them. They will not leak but if you leave the nipples open it will be a negative if the radiator should ever need to be used in an automatic equipped car.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.