Denny those are actually the axle to spring mounts! I think a cadd drawing on page 1.Those are slick little axle stands to hold the axle while you build it.
What caliper/master cylinder you using?My orange kart is using the same brake hub and rotor! Locking up the tires is how I turn around in the street
And probably the same spindles! Those BMI units can handle a beating, can confirm.
The build quality goes to 11, and no 10 cannot be made louder. So clean!
Love the masking tape on the drill cord