You can find it at Ali
The Gorilla Glass 5 on my S61 started to show scratches after 2 weeks without additional protection. Be sure to leave the original film on and have new protection against scratches fitted.
You don't need a screen protector on a Cat. Or do you mount an additional bumper from a Hyundai on a tank? It looks like shit and is unnecessary. I've had Cat phones since 2012 and never had a problem with the screen. Even drove a truck over the Cat and it didn't break. Was bent like a banana afterwards but everything worked fine.