After 2 hours of trying to get the water pump belt on I need help (and a drink). The AIM shows belt 3940990 (which I bought from Quanta). But there is no way it will fit around the crank, fan and idler. Is there a trick? Are the AIM and Quanta wrong? It seems like the idler pulley adjustment would be enough slack to allow the belt to go on. The belt is 33.5" and is listed as used in 68 and 69. I don't see how this is possible since the 68 idler pulley fits inside the belt and the 69 pushes on it. It seems like the 68 would need another inch in length.