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So a couple observations after looking at this style. What it looks like they did (at least to me) was drill the proper size holes in the front side to fit the pintle and the bolts, then the back side they drilled oversized holes to fit spacers. Then they added a plate over the spacer, and...

So this is the picture of the rear "bumper" non airlift type from my M1123. As you can see it's basically a 2"x4" piece of tubing. I haven't taken a closer look, but I would assume that they just cut a hole in the back, insert a piece of tubing that is the right size for the pintle, then weld...

However... Depending on your skill level with machining tools and a welder, the A2 non-airlift rear bumper doesn't use the bracket with the pintle, and just uses some type of tube welded into it.

Looking in the parts manual at the airlift bumper it appears that they do just cut a pocket into the bumper, then add a reinforcement plate to the outside surface to give it additional strength. EDIT: the ECV/REV parts manual has the same design for the airlift pintle where it's a cutout into...