Can't Order nuts

we had some transportation damaged bumpers on 2 23 colorados.
The body shop needs some of 11569960, but workbench says they are 'correct for application but not available'. When I called Par-tech, they gave me another number, which I ordered. It was the same nut except for smaller and the bolt doesn't fit.
11569960 is used on front and rear bumpers in 22 and up silverados and colorados. I can't find anything like them and my sales department might murder me if the body shop can't finish this job over a few clips.
Any ideas or anyone randomly have these sitting on their shelf? Or know the old number?
The body shop needs some of 11569960, but workbench says they are 'correct for application but not available'. When I called Par-tech, they gave me another number, which I ordered. It was the same nut except for smaller and the bolt doesn't fit.
11569960 is used on front and rear bumpers in 22 and up silverados and colorados. I can't find anything like them and my sales department might murder me if the body shop can't finish this job over a few clips.
Any ideas or anyone randomly have these sitting on their shelf? Or know the old number?