Squareback vs round back alternator?

Sounds like Wayne's problem is that the pivot ears are too wide on the square-back alternator. I don't recall that dimension being any different in the roundback alternators. Usually, the issue is the other way, where spacers are needed to fit the ears between head and brackets. I recall that spacers were used in many factory setups. When you do need spacers, Ace Hardware sells blingy chrome ones in various thicknesses.