Hi @dario22468
The touch screen along with the LCD screen is part of the display assembly. It is one complete module so they cannot be changed individually.
Here's a [https://www.youtube.com/watch?v=L0O6w88lRhw|video] that may help.
Search online for [https://www.google.com/search?q=moto+g8+plus+lcd+touch+screen+assembly&client=firefox-b-d&sca_esv=d646d6a9abce4886&sca_upv=1&ei=otjeZfGMJ_Gv4-EP0LqPgAY&ved=0ahUKEwjx5d7ouc2EAxXx1zgGHVDdA2AQ4dUDCBA&uact=5&oq=moto+g8+plus+lcd+touch+screen+assembly&gs_lp=Egxnd3Mtd2l6LXNlcnAiJm1vdG8gZzggcGx1cyBsY2QgdG91Y2ggc2NyZWVuIGFzc2VtYmx5MggQABiABBiiBDIIEAAYgAQYogQyCBAAGIAEGKIESN7vBlCTC1jh4wZwAXgAkAEAmAHbAqABhxSqAQcwLjEuNi4zuAEDyAEA-AEBmAIJoAKdD8ICDhAAGIAEGIoFGIYDGLADwgIIECEYoAEYwwTCAgUQIRigAcICBhAhGAoYCpgDAIgGAZAGAZIHBzEuMS42LjE&sclient=gws-wiz-serp|moto g8 plus lcd touch screen assembly] (supplier examples only) to find suppliers that suit you best.