MerCruiser 9412A18 1547-9105 Alpha One Gen 1 Upper Unit Gearcase Housing Empty Power Steering 306107 is the part number

306107 is the part number on this

Volvo Penta 3853805 Front Engine Mount (OMC 983903 / 0983903)

(3" Across center-to-center for the bolt holes)

but almost perfect shape otherwise

Induction Manifold: 13545A 1 814033-C1

MerCruiser 9412A18 1547-9105 Alpha One Gen 1 Upper Unit Gearcase Housing Empty Power Steering 306107 is the part numberItem Description Basically the Upper drive housings are the same no matter what drive engine sterndrive you have from that period of 1983 1990 (I 4, I 6, V8 120hp, 140hp 165hp, 2. 5L, 3. 0L 4. 3L V6 4cyl, 4. 1L 3. 7L 170, 470, 898, 305, 350, etc..) There was a different style of housing from 1983 86ish maybe that was the same internally, but it didn't have the rectangular splash plate. More or less covered in my infographic in the pictures section.