Mercruiser 32754 32754T Alternator Mounting Bracket Brace 2.5L 3.0L 120hp 140hp Pulley - Water Pump GM couplers look just like

GM couplers look just like this

For MerCruiser 3

Other notable parts: 510188

Works on / compatible with all OMC Stringer Sterndrive upper units from 1968-1985 (low profile gearcases only)

Works on 1981-1986 120hp

Mercruiser 32754 32754T Alternator Mounting Bracket Brace 2.5L 3.0L 120hp 140hp Pulley - Water Pump GM couplers look just likeOff an 80's MerCruiser 120hp 2. 5L alpha one Sterndrive Engine Inline 4 Alternator Brace # 32754 32754T (This is an earlier style that is the same dimensions but a bit thinner) Used in many applications from 1970's 1980's. Its about 11" long The slot is 3" Generally found on 120hp models with exhaust manifolds that have 6 bolts on the front of them. The application list is outlined below. Yours should look just like this one. This is a stock photo you