Kelsey Hayes SBP disc brake questions

You certainly are making a big mountain out of a mole hill.
Those repop caliper mounting bolts that you got from that guy in Canada that sells them, are made correct, and nothing wrong with them.
Install the caliper, hose brackets, to the spindle, and tighten down.
You will find nothing wrong.
And by the way, the factory manual that you show a picture of is for the BUDD disc brake system, which is totally different from the Kelsey Hayes system.
BUDD disc brakes, BENDIX disc brakes, KELSEY HAYES disc brakes, are different from one another, and even though they all are 4 piston calipers, they are all unique to one another.

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