Due to a leaking 30 year old radiator, I had to upgrade. I sourced an Aluminium 3 core radiator out of a S13 Silvia ($230 delivered) and it bolted straight in practically.
The top radiator hose I cut in the middle and inserted a 32mm diameter stainless tube, 140mm long as the top hose is further away.

This unit came with twin thermo fans and is controlled by the Autronic SM4 automatically via a relay.

Oil cooling comes via a oil filter breakout adapter with AN8 fittings, a remote oil filter is fitted behind the grill and a 13 row oil cooler sits in front of the radiator. These are all connected with braided oil cooler hoses.