I had to drill new holes for the LED attwood fixtures. I used ample 4200 to seal it all up. I wanted Perko but they are very very proud of the fixture. I ultimately replaced my all around light with a 24 inch Hella Marine fold down. I had to clear my radar as well. If you have a hard top I highly recommend replacing the courtesy light/ spreader light controls with Grady's Lumitec LED touch light. You active it by touching the lens and has variable light output and it's red or white. West Marine sells one similar but it does not have the spreader light switch. I also upgraded my spreaders to LED by Taco. I do not recommend them. Next season I am buying the Lumitech spreaders that Grady uses.