Mercury Outboard 140hp 115hp Exhaust Driveshaft Housing Mid Section 1573-5239A4 Exhaust Boots This should technically replace the

This should technically replace the later kind with the Ventilated-gear tooth looking exterior as well

One is one one side

170hp 180hp 185hp 260hp 350 305 CID 330HP

it would be probably wise to rebuild it

Likely Found on Johnson / Evinrude 25hp & 35hp Models 1977-1978

Mercury Outboard 140hp 115hp Exhaust Driveshaft Housing Mid Section 1573-5239A4 Exhaust Boots This should technically replace theRemoved from a 1979 Mercury Outboard 140hp (S N 552993) Inline 6 cylinder 2 Stroke Item Condition and Notes: Good Condition This has the Two Bolt Mount for exhaust extension Plate: (There is a similar one with a 1 bolt pattern that looks the same. Make sure yours has the two bolt holes) Please Inspect Pictures for condition Part #'s Drive shaft Housing: 1573 5239A4, 5239A 4 Exhaust extension Plate: 66097, 74257A 3, 98518A 4, 43290A 4 Exhaust Tube: