I bought the Buck Alonquin domed top last year and had to grind down the top a little with my sander to fit in the strainer. Be careful to do it evenly and not take off too much.
You could also get some lexan, cut a new flat top with a band saw, finish it off with a drum sander and drill a hole in the center with a drill press.
Best,
Joe
Joe
1977 28' Express
Twin 318s, raw water cooled
Ohio River