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It doesn't matter. The early alternators have a round plug connector, and the later models have an oval connector. The wire pinout is the same for both.
My chassis is a 95', and has the oval connector coming off the main body harness, but I am going to change the plug to the round connector so I can use the early model alternator.
Does this make sense? Basically, you can go either way with the alternators, and switch to a round or an oval plug as needed.