Does the RB20 come stock with an oil cooler that is normally mounted on the radiator support?

Trying to figure out WTF this is, and I'm almost certain its an oil cooler. There are two lines that run from somewhere below the motor(I have no lift) and they run through a filter(Nissan part no. 4983604U00) then into an aluminum tube that is shaped into a square mounted on the radiator support. There is no AC installed on the vehicle(it's an R32), and it is not the GTR.

They're rotted, so I plan on replacing it, I just kinda wanna know what it is before I go taking it apart.