I bought a two row alum radiator that generally fit in the space in front of my engine.
Used 1 inch by 1/8 inch aluminum to make necessary brackets (bought 4 ft lenghts from Home Depot)
Used stock shroud from a 26 inch Mopar radiator, and mounted with homemade brackets.
Put 16 inch $100 electric Summit fan inside shroud on radiator.
None of the measurements have to be precise, as making brackets
and mounting everything is really simple. Improvise.
Just have to make sure the fan you buy will fit between radiator and water pump.
In my case, a 3.5 inch deep fan fit with about 3/8 inch to spare.