For bags in the range of 62 to 80” and 23 to 45kg, the oversize/overweight fee is $75 plus taxes: https://www.westjet.com/en-ca/travel...s/service-fees

Assuming it is just 2” over and not also overweight, it is likely within the measurement tolerance that an agent will accept without applying the charge, especially if it is a soft shell vs a hard shell.