FOLLOW THE MODEL KEY BELOW TO DETERMINE YOUR NEW OUTBOARDS SPECIFICATIONS PAYING SPECIAL ATTENTION TO THE SHAFT LENGTH. YOU CAN DETERMINE THE LENGTH BY MEASURING THE HEIGHT OF THE TRANSOM CENTER (SEE DIAGRAM) CALL FOR ASSISTANCE ON MULTIPLE ENGINE APPLICATIONS TWIN OUTBOARDS ARE TYPICALLY 25" TRIPLE OUTBOARDS ARE TYPICALLY 25" OUTSIDE OUTBOARDS AND CENTER IS TYPICALLY A 30" OUTBOARD IF YOUR UNSURE CALL FOR ASSISTANCE.