Roundback vs. Squareback alternators?

SixgunSal said
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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I’m going through this fiasco with my 67! I ve been trying to hook up the second field with a second wire.At first it was charging at 12.3v at alt and battery. I replaced the Mopar Performance blue race only VR with a stock electronic ignition VR and hooked new blue wire,now it’s slightly overcharging! Still trying to sort out botched wiring. I did not remove the insulator from the second field to try just a one wire like original.