I have the same port lights on my 238 and the same problem with them leaking. Last year I made enquiries with Ryan Crawford from Winnisquam Marine. He managed to source some from the manufacturer who originally supplied Four Winns, as Four Winns say they are no longer available. Unfortunately I didn't go ahead with replacing them and just keep them closed all the time. So Ryan is your man!
Hope this Helps.
Winnisquam Marine, Inc.
ryan@winnisquammarine.comPhone: (603) 524-8380
Fax: (603) 524-3510
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Regards
Beyond the Blue
"If we improve with age I'm now excellent"
Ex 1998 238 Vista 5.0Gi SX DP
Lexus RX300