If it's the same kit as for the FE 570, I believe this is it (found this on another forum):
It is a spal 4 inch unit.
124 cfm at 1.9 amps.
PULL model
4" Paddle Blade
Motorcycle/ATV Fan
12 Volt Part Number: 30103018
Description: VA32 - A101 - 62A
Retail Price: $67.95
Can be found for 44.95-55.95 at various online sellers.
It appears to be about 4.25" (109mm) total diameter of the outside case.
I'm also looking for the connectors, so will be interested if anyone finds them. I haven't checked the Husaberg dealer yet, as they're about an hour away.
I've also looked at the Dirt Tricks fan kit, but have decided to make my own. I've got a number of 3.5" fans from computers. They may be lower volume, but with one on each radiator, I should be ahead of the game. I've heard of others using computer fans with some success. Even if I have to replace them every so often, it will be worth it (I have a very good source for at least a couple dozen;-). I'm fabricating brackets out of 1/8" x 3/4" aluminum. Just need to find a power plug to mate to the Husaberg plug, and decide where to mount a switch.
-T