i thought my wheel wasnt fitting once but i put the brake in too far and that means that the spacers arnt perfectly in line with the holes to put the axle through try moving the brake back a little?
I had this problem. Put your brake halfway in and have the black rubber part sticking out. Then put the wheel between your spacers. then smack the brake with a hammer or some wood until the spacers and wheel are aligned with the holes in the deck. Don't go to far cuz it's a pain to pull the break out.
Take a double bastard file (or just a regular metal file if you have it) and sand it down a little bit on both sides. No big deal, I had to do it with my inward forks forever ago.