Vacume canisters were included on power brake Formula S and Dart GTs with the Commando option. Yes 65s had power brakes however I belive they had to be ordered. Reason was to assist with more vacume due to the duration of the hotter Hipo cam. I've seen those cars converted to the power brakes and it turns out they didn't need the canister in that the commando motor produced sufficient vacume for the power brakes. The Commando 273 on the 67 model year cars didn't have that canister.