Not sure if you ever got an answer to your question about lens for your fluoresent interior lights. I you go to this web site- http://www.irwinyachts.com/index.html it is the Irwin Yachts web site and you can order them from that site. I have replaced all of mine on my 1984 38 CC Irwin. I might presume they are the same both square and oblong. Good luck
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