I have the Part # in my paper work and will look for them later today But $$$$$$$$$$$. I did use my screens for a long time and the trick is with them warm in hot sun and 2 people inside and outside very slowly using your fingers work them in and they did work for a long time until they got old and lost than I did get 2 new ones and they are much better but be careful with the new ones and with the new ones I leave them in all the time Nick
Sounds like you had better luck than I did with them. I could not get them to stay in and I found that they distorted the gaskets sometimes causing the ports to leak.
They are expensive for sure (on this site they show at $49 a pop and slightly less on Defender) but at the rate the old ones were falling out and overboard they had taken on an almost disposable nature. I really wasn't kidding in previous post when I talked about the wind blowing one out. Gust came from behind and down the companionway, out popped the screen and overboard it went. They really do sink like rocks.
It's been six years since I replaced them all and they still are in place.
Honestly with Lewmars reputation for quality, they ought to be ashamed of the design of the screens they supply as original equipment.