This is an Italian maker flexible coupler for All 850 models that connects the small rear outer stub axle to the transaxle axle shaft by means of a splined sliding socket inside a shock-absorbing rubber piece which is inside an aluminum outer barrel-type hub.
84mm outer diameter.
Bolts are spaced at 48mm.
Fiat 850 Spider Coupe (1966-73)
Fiat 850 Sedan(1967-73)