Bumper Help

You have the wrong bumper for your car. The bumper bracket mounting holes you show on your frame rail are for a standard bumper. The bumper you show is a shock mount bumper.

‘73’s all had standard mount bumpers front and rear, and the frame rails would only have mounting holes for standard brackets. Shock mount bumpers started in ‘74, but then were discontinued for the front starting in December. 74’s built in December until the end of production for the ‘74 model year had non-shock bumpers in the front and shock mount bumpers in the rear.