The Colts earned their place in the premiership clash after proving proving too strong for undefeated ladder leaders North Geelong in the second-semi-final.
They will meet the winners of this weekend's preliminary final between the Magpies and St Mary's.
"I've hope you got suits, Coach Paul Forbes said post game. "Because we're off to the big dance!"
The Grand Final will be played at St Albans Reserve - 9.15 am on Saturday September 10.