leaf spring perch problem please help

[Y-TRY]

I have the same tapered housings and used those DSM perches. I cut a 3" exhaust tube in half and used it's pieces as spacers. I centered the rear and set pinion angle, tightened them down, then welded only the bottom half to the axle tubes. I then took out the spacers and bolted the top halves back on, for lack of a place to keep them.