Roundback vs. Squareback alternators?

Right, which is all I did to convert mine from round to square back. I just removed the hold down screw from one of the field blades, removed the fiber insulator washer and reinstalled the screw. Grounded and it charges great.


I have a 69 dart the alternator just went on, and the only one they had around here was a square back one. When you removed the washer, did you put the brush/spring back in? With just a bare hole if I take out the brush, spring, washer the screw is too long.
I'll add some meat to this - I have an alternator that looks that is the round back and napa gave me the square back even thou the picture on their site shows a round back. So I have zero background to know what to do to this squareback to make it fork for my dart. Not trying to throw a monkey into the wrench :) but the car has MSD ignition dist, coil, and box.
any help will be gratefully appreciated.

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