There appears to be some holes in this wikipedia article
http://en.wikipedia.org/wiki/Daytime_running_lamp
But it appears that cars manufactured after Jan 1., 1990 (ie practically all 164s) and sold in Canada must have some type of DRL. Initiatially based on running the low beams all the time (as in Scandinavia), later by this method, by running the high beams with reduced intensity, or the front turn signals.
Therefore, I don't see any need for extra bulbs in the Canadian cars. In additon to Yiminlu's experiences, it would be interesting to hear from Canadians with different model years have different experiences. It doesn't sound likely, but Yiminlu, is your 164 of extremely early production (ie before 1/1/90)? Could a PO have disabled the DRLs?