Pelican are correct. I did the same thing, found conflicting info so I bought a 4A first thinking it'd make sense it's the early one, right? And I've got a '97 so they don't come any earlier!
Found out that the 4A will technically 'fit' in an early car, but the rotating part is of by 90 degrees, so it'll try to start the car in the key off position!
Had to by a 4B which is the correct one for early cars and all was good. 4A is for later cars.
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