Waterway is actually a very reputable brand for skimmers.. I wouldn't hesitate to buy another one...

your other option is to buy a skimmer with a bigger opening and enlarge your opening/redrill the screw holes.

A skimmer with the same size opening but different hole pattern "should" be ok, because the gaskets used will create a watertight seal, but if you're not comfortable with that idea, don't do it.