This is how I mounted a 4.3" touchscreen inside my Ender 5 S1 in the original screen location.

Details about the screen:
https://www.waveshare.com/4.3inch-dsi...
I bought mine from Pi Hut for £41.89 including vat and delivery. Waveshare say the screen support these's Pi models, but you would need to check the layout to ensure cables and sockets are accessible:
Pi 4B/3B+/3A+/3B/2B/B+/A+

My printable screen mount: (Thingiverse or Printables links)
https://www.thingiverse.com/thing:617...
https://www.printables.com/model/5540...

Additional hardware I used:
Raspberry 3B+
AZDelivery Passive Black Heatsink 2 pcs (£2.29 Amazon)
Vikye DC-DC Step Down Adapter 12V/24V to USB 5V 3A (£6.34 Amazon)
M3x12 countersunk screws (4)