MerCruiser 70981A3 Early Exhaust Riser Boot Bellows 3" to 4" Tube Hose V6 V8 350 Timing Cover but they both are the

but they both are the same 153 tooth unit / 12-3/4" overall diameter

Used only on EARLIER MerCruiser 470 Models S/N 04625580-05120244

Mercury Part Number 13-20632 Lockwasher for starter Ratchet

MerCruiser 470 4-cyl 165hp 170hp 180hp 190hp 3

MerCruiser 70981A3 Early Exhaust Riser Boot Bellows 3" to 4" Tube Hose V6 V8 350 Timing Cover but they both are theItem Details & Compatibility MerCruiser OEM 3" to 4" diameter Exhaust Bellows Tube 70981A3 You will get the exact pair as pictured with the hose clamps. One of the risers has a little deformation from being tightly pressed against where they tube elbow turns down, but nothing that will affect function. Please inspect pictures closely to ensure satisfaction. Generally used on certain Early Design 1982 1987 on GM 4. 3L V6 185hp 2bbl 205hp 4bbl & 5. 0L