Did that on a 1999 H380
I replace my speakers last year for the same reason, the covers fell apart. When I took the old speakers off (out of the arch), they were in poor shape. So I just measured the hole and looked up in the West marine catalog for something that size. Got two good speakers--think they are better then the old--and easily installed them. The wire clips from the old ones just slipped on. Easy job and it was inexpensive as well.