Is this the forward hatch? We've seen a couple of different hatches used in the v-berth of the 40.5. What it looks like from the photo is the hatch style in the link I posted; basically a piece of plexi that closes onto a D-shaped gasket. The hardware is Bomar but the lens, hinge, and interior trim were all made by different suppliers and assembled at Hunter.
If that's the case this receiver is probably as close as you'll get, but I'll check on Monday.
If the hatch is a true Bomar hatch it will have a serial number on the hinge side. Let me know that number and we can research parts for it (we sell them for less than Bomar's retail price).
But if you can make one out of starboard I can guarantee it will cost less than the replacement part.
