Then it should go right on the motor itself. Is it just a fan or did you get one with the clip on heat sink? That would be the way to go.
Body is a Suzuki Escudo(by HPI), I was experimenting with down-force. Worked great in the 19T class on our tight/technical track. I decided to go back to a more typical race body for this season, sense I'm entering the open mod class. With all the extra speed, the Escudo would be more of a parachute than a race body...