I replaced both of my hatches a few years ago on my 322 with Lewmar direct replacements. I caught them on sale at Defender. I know one hatch I got was the Lewmar Size 40 medium profile (Defender pn 901385), but I'm not sure if that was the forward or cabin hatch. At any rate, get the opening measurements, and you can match a new Lewmar hatch. It was a pretty easy job!