The photos show all 4 to be 2 field terminal alternators.
2 are the updated style with the thin center
The pulley diameters are comparable.
Do you need 2 groove or 1 groove
There is a slight offset difference between 1 groove and 2 groove.
Take an ohm meter to the store and check resistance from each field terminal to the housing.
You meter should read "OL" or whatever it reads when the leads are not touching any thing
