Thanks for opening my eyes to how to properly do a search (I'm also wiping the egg from my face)
After doing the search for Raspberry Pi, I did find a Raspberry Pi Shield but it covers the entire RPi (USB & Ethernet ports). I am in need of a HAT which does not cover those ports. When I looked at the other parts found, they were mostly already built boards (Matrix HAT, Touch HAT). The RPi themselves do not have a PCB component.
So based on what I've now learned, would you agree my only option is to build a custom part (reduce the size of the PCB) using the Pi Shield part?