This is the touchscreen that fits perfectly in this enclosure:

amazon.com/gp/product/B0BG3SB2MS

The screen comes with a back cover that protects the electronics.  The whole thing fits in the case perfectly with no fasteners.

The cover/frame fits snugly onto the box, centering the display within, and with a uniform frame around the screen.

I run mine upside-down so that the connectors are on the left-hand side, but there's nothing preventing you from using it the other way around.