Sorry, I didn't realize there was more than one reply in here. I haven't checked in awhile.
OKAY!
It isn't just one full answer, there are several solutions here depending on your application. For a Martin sunroof I restored, I had to use clear silicone around the frame, fit the glass in, and then clamp into place for 24 hours. This allowed enough clearance all the way around for the edge for the glazing to fit.
Next up, I had a set of diamond ports that actually had a U channel type trim as the frames came apart and when assembled, allowed the correct pressure to make them water tight. The closest channel I could find is this available through Primeline:
Please make sure your measurements are close as there are sever sizes.
Next up, I am also restoring a real bad set of the female sex emblems. These are different as they weren't glued in nor were they with a U channel. It appears the lenses were placed in the frames with a strip of 1/8" thick setting tape. It was enough to hold the frames to the lens and together. Next, the frames were just spot welded for assembly. To fill in the outside gap and waterproof are a similar edge glazing in size to this, but no longer available. I am waiting for the universal one to show up in the mail.
Available from CR Laurence.