Did you want them always on? Personally I would rather a switch on the dash to control that independent of the parking lights being on, which those equipped with stock fog lights should have. I assume it does not already have stock fog lights and no switch or location for one on the dash?
I don't know the stock wiring for that so I'd find one at a junk yard with fog lights to see how it's set up and consider just taking the fog lights and wiring from one there.
If on the other hand you already have stock fog lights, just use that circuit, wiring, and switch to power the new ones instead.