I've got a set of kartboy mounts laying around that work well for mounting them in the stock spot, pm me if you'd like to buy them. That'd be for the stock fog spot, are you mounting there or somewhere else?
I had 500's, I'd reccomend running them on the relay they give you, its a safer solution long term and if you decide to go higher on the wattage you don't have to rewire later.
Don't the housings have a single screw on the front you unscrew to let the glass free? You shouldn't really have to do any prying.
I ran the wire to signal the relay from the fog light wiring, so that switch worked for the lights just like the fogs. I'd already wired the fogs to come on whenever I wanted (not just with lows), and I think its a good idea to do that too since you want them on with your high beams or possibly on their own.