The skimmer baskets come in a handful of easily identifiable sizes. An 8 3/4 clearly isn't a 7 1/2 or a 6 7/8. (Vice versa / etc etc) The plates will list the size and chances are its an easy decision.
SWG is next year, not in the budget after a filter, pump parts, and way way too many jugs of chlorine this year.And don't even get me started on SWGs. It's a game chchanger.