#1 Chrome has to come off, first, You will haver to grind thry it , to base metal to braze on the tabs.

seek out one thats painted instead, perhaps?
rear end , you will have to add a cross brace behind the Disc tabs to join the 2 stays in a small triangle .

In both cases you need to get clear on the ISO standards for location for both
and probably make Jigs to hold the parts in place, accurate locations,
while you are brazing them ..

Got a TIG welder? that will do the job of attaching things,
still need the locations spot on.