$99.? Are you sure?
I paid twice that for my bronze NFMs. That is a great price Kevin. Someone else installed those and, I thought, paid a lot more.But Jeff, Kevin is right. You need 7x15s. Otherwise you will have a lot of gap to fill. And you cannot fill it with caulk, you have to build it up some way(see Related Link). Even with the 7x15s they will not be a tight fit.And bolt-thru portlights, like mine, are a bear to install. In fact the inside and outside are not parallel. So you end up drilling a very large hole in order to line up the bolt with the boss on the frame. Just another way for water to get in.You have to use a lot of the right kind of caulk around that outside frame. Use lots of tape to protect the gelcoat. Let it squeeze out but do not fully tighten until it sets up. Then let it sit for a day before you take off all the excess.If I were to do it over I would install the Beckson Rain-drains(sorry Kevin).