I would recommend getting the Derale dual 12" electric fans #16812. You can get them from Summit for like ~180 (not listed in the catalog but they can get them). You'll also need to get the relays and temp switch with this, so prepare to add another $30 or so). This was about the best fit I could find when I measured the radiator. Many fans are too thick to clear the accessory pulleys. A lot of the dual fans are also too wide for the MkII radiator. The MkII radiator is more "square" than a lot of the factory radiators I measured. You might also want to consider a larger amp alternator as well. The factory alt doesn't provide a whole lot of spare juice, so you might not get anywhere near the CFM rating they advertise. If you live in a really hot area you might want to stay with the mechanical fan.