Okay ... the disc brake assembly bolts to that plate (see blog further down this page) ... the plate is screwed down onto these two tabs.
Of course, I couldn't mark where the tabs go without having the rotor disc mounted ... so I could get the correct spacing from the frame ... and the correct angle to fit the brake unit around the rotor. Anyway, I positioned it ... looked at it carefully ... marked it with a sharpie ... took the axle off the frame ... held the brake unit (with tabs) in place ... tacked each tab ... took the brake unit off ... and finished welding the tabs in place. Spent lots of time "truing" the rotor unit in hopes that it will rotate without side-to-side wobble. 
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