Counter34

So I was trying to wire something directly into the relay of the LH Headlight, (i tried to put in a small wire) and when I saw that it wouldnt fit securely I took out the wire only to find that the headlight wasn't working when I plugged the relay back in. More than 3 hours of trying to work it out has yielded nothing. The relay itself is good (I used the LH relay on the RH headlight and it worked), fuse it good (tried on RH headlight. I even tried to hardwire the relay which worked -- but still nothing with the relay plugged in. Highbeams and corner light work. I have absolutely no idea what happened, or why it isn't working. Some insight would be greatly appreciated.

Do the rear and front calipers + 324 rotors bolt up directly or just the fronts?

Basically what the title says, I'm looking to upgrade the brakes on my R34 GTT as the stock ones I have right now are seized. I was looking into a G35 Brembo kit but was just wondering how it would fit in terms of the caliper bolt holes, or if I'd need to modify them in any other way. I live in Canada so parts are hard to source. Also, in terms of rotors what would be the best option? Thanks