A 1974 Duster - My 2nd one, 41 years later!

I drilled a slotted hole in the center of the bumper (will be hidden by license plate) so I could hang the bumper and get it close to where it will live. This way I can figure out just where the 3rd plate goes, I made a black sharpie line on the bumper in the center of the OEM shock mount hole. Then welded the 3rd plate centered on that line.
26794047029_efaf7274db_b.jpgIMG_4703 by Alexl5280, on Flickr

Brackets on bumper. 2" by 3/16" pieces of steel welded to "c" metal.

37853747664_932e92af69_b.jpgIMG_4702 by Alexl5280, on Flickr

26794049989_f4c16ca9c2_b.jpgIMG_4701 by Alexl5280, on Flickr

This is the angle of the 1" by 3/16" steel that brings the mount through the OEM bumper shock hole. The piece is 6 3/8" long, not sure of the exact angle. I started chopping the angle until it fit onto the plate and went through the center of the OEM shock bumper hole. Then as you can see in pic two, I welded another 4" piece of 1" by 3/16" to the bottom of the angled piece. Then cut the slots for up/down adjustment.

38538871302_ed708e5209_b.jpgIMG_4704 by Alexl5280, on Flickr

I'll be powder coating the mounts in black.
The rear bumper with the steel mounts weighs 12.35 lbs.