My 20 year old Privilege
482 has Lewmar
hatches, they never leaked, lens replacement is simple as they use a auto winshieled type sealant
strip that seals
perfectly but does not stick to the lens, of course there is also a bead of silicone around the edge. I bought a sheet of plexi and cut out a set in a few hours, fitting each one is about a 20 min job, I use Dow Corning 795 black silicone, less than $10 a tube. The original gaskets are still good. My only complaint is the friction hinges wont keep them open, but this seems a common problem with all brands.