Read this tutorial https://wiki.beamng.com/Simple_skin_tutorial.html This one too since you want to mod the ETK https://wiki.beamng.com/Introduction_to_skin_system.html
Please help, even before the replace! The vehicle skin body has been changed this way! No results are coming.. no matter what ever skin i upload on this body! Is this something related to ETK800 adjustable files which are conflicting and messing the mcqueen body and texture ?