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All that I put in my previous reply was a web address and in retrospect that is not very helpful.

I have a 1985 Montauk and am the original owner. The junctions for the nav lights are a terminal strip on the inside of the port stern. The strip is covered by a small box with "Unibox" stamped inside. I assume that this is original. If you go to the website above you can find an identical box in a variety of colors. The boxes are intended for a different purpose so that one would have to drill holes for the wires to enter and for mounting screws.

I have bought such a box but have not yet replaced the original.