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I’m wondering why the 1976 fd isn’t "tecnically" a FD.
The difference between 1975 and 1976 22c.u. models (here in Europe) was minimal, and a lot smaller than (i.e.) the 1968–>1969 ones.
The differences in 1959-1967 (as I know ) are also only in upper cover shape. Technically I noticed only the new AC fuel pump in 1960 and the fixed carb high speed jet in 1963.
The major FD evolution IMHO is in 1967-1970 era.
Between 1967-1968 OMC renewed the leg (with internal exhaust pipe and external squared design), the gearcase (squared design) and the prop (coming from 9 1/4×11" to 9×10") ,
The 1969 18/20hp P.H. is completely different from 1968. OMC changed carburator (completely, not only venturi size) intake manifold (larger carb flange), condensed fuel circuit (with external hose from intake to to bypass cover). They also made the 25 hp model with the same innovations and different Cyl head, rods, pistons and crankshaft
Last (estetical) big change came in 1971: changed the midsection ( carrying handle, steering housing and dumper covers) and the upper cover assembly.