Doing some additional research, it appears this piece is called a "Skid Plate" which really isn't an accurate term for the piece, but whatever.
I've found three part numbers:
23243492 - This is the Denali chrome piece. I (unfortunately) have chrome bumpers, so this would look awful
23243493 - This is referred to as "paint to match".
23243494 - Black, grained. It seems this is referenced as the base model unit and doesn't really look like my stocker
This one on eBay looks close: https://www.ebay.com/itm/New-Skid-Plate-Front-for-GMC-Sierra-1500-Truck-2016-2019-GM1015122-23243493/233312813534?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649]
I'd prefer an OE piece, but it is just plastic and it doesn't appear anything matches OE unless I go with the 23243493, and getting the piece paint matched is more invested in work than I'd like. Thoughts?