Not too sure this booster fits canadian pontiac.If the booster is from an Impala they are Impala only vs.big U.S. pontiac because the bolt pattern is different and the US cars booster have very long studs to go through the firewall.If someone on the sight has an actual booster that came off of a Canadian pontiac -big car then it would be easy to tell.Again U.S. impala and Canadian Impala fit each other-but not sure on the Canadian Pontiac