[C320-list] Round cabin Lights replacement parts or replacement

[Guy Smith]

Hey All!
I'm looking for the white plastic ring that snaps over the lens and holds the lens to the body of the light. There are two directly over the table and a bunch along the Port and Starboard sides. 
There are some cracks in the plastic ring that holds the lens on and this Saturday (sailing in 30 knots true and 3-4 ft seas on the Chesapeake) one plastic ring split. They're kinda delicate if you ask me, although we were bucking/pounding pretty good on the up wind legs.
Has anyone found replacement parts or do I have to get new light units? If a new unit is required, has anyone replaced them? Where would I get a replacement? Will it fit exact or will I need to fabricate or cut to get a new one in?
I apologize because I think there has been threads on this before but I didn't save the emails.
Thanks, ~g
Guy & Liz Smithsv Pleiades '97 C320 #452Worton Creek, MD, USA