choosing the right alternator

Fred Scigliano said

I looked at that but was wondering what I need because it says { external regulator not included} I am new at wiring so forgive my ignorance just want to do it right.

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Internal regulator is inside the alternator. it uses 1 wire. External uses a box with a number of wires attached to it. This allows the removal of the external regulator for a cleaner look under the hood.
What are you using? Do you already have an external voltage regulator mounted on the firewall?