Yes, these bulbs just plug into your stock housing, I can't tell you if they would fit into an aftermarket housing, it depends on the housing itself. The relay is included with the price. And yes, the relay directs the power straight from the battery instead of using your factory harness. As long as your DRLs are on a different circuit, they won't be affected, otherwise you will need a warning cancellar. We do ship internationally, It will probaby be around $15 to Canada. If you add the items to our shopping cart and type in your address, the website will give you an exact amount. Let me know if you have any further questions.
-Garrick