Are these fans big enough if I used both of them ? They are made by Spal which I feel is one of the better manufactures of electric cooling fans. These was used on a 4x4 wheeler. If I had my choice I would use a pair of 12" fans, these are just a couple inches smaller and I already have them. If I use these I will need to get a fan controller like used on BMW or Volvo cars. Sorry.. unable to get pictures to post. The fans are about 10" in diameter, are these big enough ?