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I think it could be next to impossible to locate that single piece. Those wilcox lights are long out of production and they are very hard to find. When they do come up for sale they bring top dollar. The only place I know of that may have one would be Joe Orlando's in Texas. He has all kinds of misc whaler parts though, if he has it it could be pricey. Here is his contact info.

Joe Orlando's Fiberglass
Boat repairs and restoration
Gelcoat work and repair
Boston Whalers
1145 FM 518, Kemah, Tx
281-334-2902

Outside of that I know specialty sells new lights that look similar for $175. Though I know another member bought the same what looks to be the same set from a local marine surplus store here in Michigan for $30. They were not in the original packaging nor was there a manufacture stamped on the part so it is still a question as to who makes them.