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The advice given on this site is based upon individual or quoted experience, yours may differ.
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John, I'm pretty sure they're Aqua Signal Series 25 on your year, but I'm not positive, it's possible they're Hella. If it's AS, they go for about $20 at Fisheries Supply here in Seattle if I remember correctly. If no one here can give you a definitive answer, try Catalina in FL (don't have the number handy).
Been there, done that . Couldn't blame mine on 'the Admiral'; did it myself when a dock line whipped around as I yanked on it and popped the lens into the water.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.