'73 Dart Swinger Bumper help needed!!

I can't get my frt bumper to align up with my bumper brackets. I have the full metal y-type bumper brackets along with a re-bar brace that attaches to the braces. Per my shop manual the '73 uses this type bumper assembly. My R+L bumper brackets and rebar all fit together nicely and bolt to the car but when I try to mount the bumper the holes don't align up. I bought all these parts at different times at swap meets so I have something wrong somewhere. This bumper is a 8 hole model. Anybody have a idea if perhaps the bumper looks correct for a '73 Dart or do I have the incorrect braces + re-bar?? Not sure what to do next.Thanks

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