You do know that pretty much all vehicle laws of all jurisdictions are on the internet these days, right???
Here are the BC laws that apply:
(3) Only amber reflectors may be mounted on the front or side of a vehicle.
(4) Only red reflectors may be mounted on the rear of a vehicle or on the side of the vehicle at or toward the rear of the vehicle.
I'd go with yellow if you're really concerned about following the law. Hopefully your local Dudley Do-rights will consider yellow close enough to amber.