1994 Front Bumper Adjustment

[Sixball]

Slowly putting my 1994 Sierra 1500 back together. I bought a new Bumper, Lower Valance, and Bumper Filler along with all new Hardware from LMC. I had taken the Bumper Brackets off to clean them up and paint.

When I installed everything, the Front Bumper has a noticeable Gap between the Bumper and the Filler. You can see part of the Bumper Bolt heads and you can also see the Ground in a few spots. I confirmed I have the correct 94 and up parts.

Can the Bumper be adjusted back? I need about a 1/2 Inch. Whats the best way to achieve this?

I installed the Brackets loose, then tightened everything down once the Bumper was on. I guess I should have waited until I installed the filler?

Do these have enough adjustment to gain a 1/2 inch or more movement towards the Cab?