Congratulations on your new sailboat and welcome to the forum!! Is this mount the transition bimini or the helm bimini? A photo of the bimini and arch would help. There are a few of different ways to attach these biminis to the arch, including stud buttons (snaps), sleeve and zipper track come to mind. Unless you want to install it yourself, your local marine canvas guy can do it with a tight fit.
Thanks all, yes we were hoping to purchase the zipper attachment ourselves but didn't find it. We ended up needing some repair to our jib and the sail guy said he could do the bimini repair also. So happy to be on the forum and be a new Hunter owner!