Dec 15, 2017 - 05:43 AM
I am not certain what you mean by a separate power supply. These will work perfectly on 12 volts. That being said, We have not tried them on a 389 and do not know if they fit on the factory bracket. Here is a link to the brackets for the headlights. http://www.raneystruckparts.com/peter...
For these you will likely have to drill holes to get them mounted. I think having the classic 359 lights would look great on a 389. Thanks!