To Qualify to play in League Matches, a player must possess a WHS Handicap Index.
From Para 14 of the Rules:
WHS handicaps must be used, to a maximum Handicap Index of 28.0
Players with Handicap Indexes over 28.0 may play using 28.0 as their Handicap Index.
It is accepted that some players may well then have a Course Handicap on the day of over 28.0
To Qualify to play on Finals Day, a player must have played in at least TWO league matches in the current season.
Lists of the players that have played for each Finalist Club are shown below, 1 page for each Club.
Details also available in spreadsheet form.