I've installed my Mustang pedal box (Mk II kit) and everything lined up fine. I then attached the Mustang master cylinder and went to attach the push rod to the master cylinder. When I did this the push rod seems way too long to attach to the post on the brake pedal. Even when I put all three spacers behind the master cylinder (which moves the cylinder toward the front of the car) I'm still a little off and cannot attach the push rod to the post on the brake pedal. What am I doing wrong?