@neauoire If you're going to replace, I suggest improving them. Get rid of that awful stress riser where the plate for no particular reason suddenly halves its thickness in a 90° cut.

And get a welded cover plate, which is pretty much the only way to get a proper seal around these. The slots never seal tight, just like yours didn't.

Then bed on butyl to deal with the miniscule movements without breaking the sealant.