my opinion on electric fans is, if you go that route, install factory fans.
they work way better than anything the aftermarket has come up with, are super reliable, and offer no [wildly] optimistic cfm ratings.
wire them correctly using relays and correct [heavy gauge] wire, and if you wish, an override switch. [i prefer this switch be to ground] you can also install a controller that ramps up the fan speed to only what is needed to cool, instead of a full on or off amp spike.
don't get me wrong, others have had success using aftermarket fans, but i'm not wildly impressed with their quality. in reality, what does one really expect from a $35.00 fan ? [which costs way more than it's worth]
more than likely you will have to modify the factory shrouding to get them to fit, or fabricate a shroud for your application, and install the factory fan to it.
just my old man opinion. your mileage will vary.