I was hoping to get some advice.
I have a '66 Mustang Coupe, 200ci I6, automatic transmission, with A/C.
I believe it has a Flex Fan with a 1/2" spacer.
The original brass radiator is about 2" deep.

The stock radiator has been on its deathbed for years, and we've had frequent battles with overheating at idle.
I bought an ACP MaxCore 2-Row aluminum radiator to finally replace it (while we're replacing several other things).
I must have completely misread the dimensions on the new radiator...

Cooling Fan Setups with New Radiator