25-80 HORSEPOWER Model 402-500-700..........................1977-84 40 HP (Sea Pro/Marathon)......................1977 & Newer 60 HP (Mariner)..................1976 25 HP Bigfoot (4-Stroke)..................1999 & Newer 45 HP......................................................1986-89 60 HP (Not Bigfoot or Sea Pro)........1978 & Newer 30 HP (2 & 4-Stroke)........................1994 & Newer 48 HP (Mariner)..................................... All Years 60 HP (2-Stroke)................1978 & Newer 30 HP (Sea Pro/ Marathon) .............1994 & Newer 50 HP (2 & 4-Stroke) (Not Bigfoot).........1977 & Newer 70 HP.................................Thru 1983 35 HP...............................................1984-89 55 HP (Mercurty/Sea Pro/Marathon)......1995 & Newer 80 HP Mariner....................1977 40 HP (2 & 4-Stroke) (Not Bigfoot)..1977 & Newer     Boat Diameter Aluminum Part No. Length/Description Rot. & Pitch Blade # OEM Michigan 19' & Up 12-1/2 R 8 3 48-42738A10 032141 19' & Up 12-1/2 R 8 3   031070 17-19' - Al, SK 11-1/4 R 10 3 48-73132A40 031015 16-18' - AL, SK 12 R 10-1/2 3 48-42740A10 032142 16-18' - AL, SK 12 R 10-1/2 3   031071 16-18' - AL, SK 10-7/8 R 11 3 48-85632A40 031053 15-17' - AL, SK 10-3/4 R 12 3 48-816702A40 031056 15-17' - AL, SK 10-5/8 R 12 3 48-73134A40 031016 14-17' - AL, SK 10-1/2 R 13 3 48-816704A40 031057 14-17'- AL, SK 10-3/8 R 13 3 48-73136A40 031017 14-16' - LL 10-3/8 R 14 3 48-816706A40 031058 14-16' - LL 10-1/4 R 14 3 48-73138A40 031018 13-15' - LL 10-1/8 R 15 3 48-73140A40 031019 Up to 15' - LL 10 R 17 3 48-73144A40 031020