With this bumper I just butt welded on the shackle tabs.
My other bumpers are the ones that the mounts go all of the way through the bumper.
To make the square holes I first drill small holes, then jig saw out the rest <img src="/forums/images/graemlins/scared.gif" alt="" /> Its alot of work, But I think its worth it...

This is the bumper with the mounts all of the way through
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89 trooper, tera low t-case gears,5.38's, 3" indy4xsus lift3"body lift,safari snorkle,warn winch,custom bull bar,custom rock sliders,warn hubs,35x13.50r15,custom rear bumper trooper pics