Dog, Grand Design is the fixture, the lenses are almost identical to the plastic perko replacement lens, they're just a tad taller & glass.
I have a 1985 Tayana and did replace my port and starboard lights last year with the perko lens since the prior plastic lens had deterioated somewhat due to UV. It was cheaper to buy the entire perko lights vs just buying only the lens. Go figure. However, some years ago I think I replaced the Grand Deer lens with the perko and had to drill to get the perko lights into the pulpit. That's been more than 20 years ago and I tend to forget unpleasant tasks, but the replacement has held up well over the years.