[SCOTI]

Most standard aftermarket hitches mount under the frame. The receiver tube + ball mount are usually located completely under the plate opening on the bumper.

You can research a hitch set-up for a Suburban, Blazer, or C10/20/30 w/the optional 'Sport' bumper. This could possibly provide measurements that you can compare to what's currently under the truck. Once you know/compare those numbers, as long as the ball mount is under the plate, the Sport bumper should swap w/o issue.

I have a 'hidden-hitch' set-up under my CC Square-body dually. It keeps the receiver tube tighter/closer to the frame which puts the ball mount positioned directly behind the license plate. I prefer the hitch tucked & out of site when not being used. I simply flip the plate up out of the way when I need to install the ball mount to tow the trailer.