If you want twin fans that can make their own tornado then get a pair of curved blade SPAL HD fans and wire them up, you can use a larger wattage resistor to step them down and you can start with the original impedance Beru part used in later cars along with separate fuses for high and low speeds, because when the two fans kick on high from a standstill the amp draw is quite large. If they are just stepping up from low then its not a problem.

anyway, I have seen a very nice system on a 88 300E, it was using its own condenser but with dual fans - the fans were being controlled by a standalone controller that sped up and slowed down the fans depending on the condenser fin temperature. The A/C performance was pretty good IMO.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)