Don't worry about the transmission oil cooler built into the drivers side of the rad.
The 2.6 doesn't need it but it doesn't do any harm either.
Mine's has the seperate trans oil cooler in between rad and condensor. I take it then there is a version with the built in cooler and one without, but either will fit?
Unless you buy a genuine VX radiator for your exact car, it will have the built in cooler fittings. Even the genuine ones probably include them now.
It mounts exactly the same as what's fitted.
Remove the fan and multiram/intake gubbins.
Drain the coolant and undo the hoses.
Basically, remove the top cover. Undo the two 8 mm screws that hold the condenser on then lift it off the bottom mounts.
Oil cooler line block unbolts from the cooler. Fold it back to the header tank and secure with a zip tie.
Lift out the radiator/oil cooler as one, but keep it upright.
Undo the screws holding the cooler to the radiator and set it to one side (upright obs)
Swap the mounting gubbins and thermo switches onto the new radiator and throw it all back together.
Refill the coolant and leave the cap off. Start the car and set the climate temps to HI on both sides and fan to one bar.
When the fans kick in, top up the coolant and refit the cap.
When the fans kick in again, engine off. Check level and top up and refit cap.
Restart and allow to idle until the fans kick in again and recheck the level.