There was a post on here a few months ago saying that a 6.0 Ford belt for dual alternators would fit a dual cp3, electric water pump setup. Couple guys said it would work.
I ended up using a reg single alternatir ford 6.0 belt and i installed the smooth pulley off ford 6.0 tenioner and put it in place of the factory ribbed idler puller on the top center of our engines.