MerCruiser 45451A1 45451A2 Propeller Early 1965-69 Thrust Washer 120-160hp MC-1 Transom Clamp Bracket this is what is called

this is what is called the "Design-I" Flame Arrestor)

Thumb Screws: 28403A 3

Shift Cradle:  322900

This would have been found on MerCruiser Alpha One & Possibly Mercury Mariner Outboard Applications from the 1980's to early 90's

MerCruiser 45451A1 45451A2 Propeller Early 1965-69 Thrust Washer 120-160hp MC-1 Transom Clamp Bracket this is what is calledPart Number(s) Included Mercruiser 45451 45451A2 45451A1 General Application Compatibility This would have been found on some early (1965 1969) MerCruiser Applications EZ Shift IA IB IC 1965 1966 120hp 140hp 160hp 1967 1969 Basically, this accommodates the Flat edge on the propeller shafts so this likely needs to still be used with early style MerCruiser Propellers Other Details Freshwater Used Parts Overall Good Condition! Purchase with confidence!