I Bought A 1990 Voyager Van With 115k Miles On It For Little Of Nothing Because The Serpentine Belt Came Off In The Rain. I Fixed It By Putting The 1990 3.0 Tensioner Pulleys In Place Of The 2 Pulleys On The 3.3. The 3.0 Pullies Have A Lip On Each Side And Prevent The Belt From Falling Off, Although I Did Have To Shim Each With A Washer To Get Them To Correctly Line Up. I Have Had No Problems Since This Fix. Hope This Helps Someone Else Out There.