voltage regulator

Well I got the car into the shop after struggling with this charging issue for several months. They checked all the wires and the alternator and the voltage regulator and they said the wires are all good but I need a new regulator and alternator. I have already replaced the regulator so all...

There's a voltage regulator from a '78 car on ebay and mine just went out, but it's a '75 and there are no voltage regulators in stock for my year. Is it possible to use a regulator from a newer car instead of my older one? The one on ebay has a black, grey and red wire but my current one only...