Glen,
No worries, couldn't find the part number so gave spal a call. I purchased and installed part #
30100403
http://www.spalusa.com/store/main.aspx?p=itemdetail&item=30100403 . I too was worried about adding more electrics to the bike but decided to take a chance because the bike temp just climbs like a scalded cat in the summer bumper to bumper. We mounted it on the front of the oil cooler and it barely fits. This is the largest fan you will be able to shoe horn in there. We were only able to hook up 2 of the 4 fasteners to the cooler but it was more than adequate because of the fit. If you are looking for a factory finish you may want to go down a size as this one is just a little too big. We wired it directly to the battery as we installed the night before Durango trip and were in a hurry. Hate this setup as it would only take one over curious person to flip on the fan and kill my battery for me. I'll end up putting it on a relay, probably this eve, triggering off of the head light wire.
BTW, installed the new RS fan. The one thing that stands out as different between the old and new is the new one has a built in shrowd around it so that is covers the entire backside of the radiator. Hopefully will be able to try out in the very near future.