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The base for that light was an amalgamation of Perko off-the-shelf parts and some custom made ones that Whaler put together to make a solid mount of the light.

You can see the exploded parts diagram for that light base in the Outrage 18 Parts Manual, available in the Downloads section of WC:

http://www.whalercentral.com/download...p?cat_id=3

Having said all that, the masthead light in the console was a terrible design and I recommend you get rid of it in favor of a tall 360 degree stern light. There has been much previous discussion of this.