I just installed this from Summit-
FLX-180 Flex-a-lite Black Magic Xtreme Series Electric Fans
Electric Fan, S-Blade, Single, 16 in. Diameter, Puller, 3,300 cfm, Black, Nylon.
3 1/2 thick, 309 dollars...I also matched it with a triple binary A/C switch,so it automaticly comes on with the air or the water temp rise...My radiator was 17x17 on the fins and the fan housing is 22x17, so it goes even with the bottom tank, the shroud fits great. I ran it after installing to check operation, It'll suck the chrome off a trailer hitch!