Nordic Tug began using Diamond Seaglaze windows around 2001. Since they're still in business, they're probably the best source for window components.
My 37 is hull #15 (built in 2000) and has Western Metals windows/doors. An outfit named Bounty Marine in the Portland, OR area now owns the Western Metals assets and still provides support. My window frames were showing their age (a few leaks, lots of bubbled and peeling paint) so I pulled them all last month and drove them down to Bounty Marine. They disassemble the window, sandblast the frame, repaint, then reinstall the glass using all new rubber/foam components. Hopefully they'll be ready for pickup next week and will look like new!