Please Help! Mod installation gone wrong! :(

Hi, I was wondering if anyone could help me fix a big mistake I made when I installed an old mod by the title "fullsize" Whenever I try to spawn a regular grand marshal, It spawns that mod body of "fullsize" and I can't find the mod. The mod was not zipped, but I'm pretty sure the mod overwrote the Grand Marshal's body. If anyone has an idea how to fix this, please let me know. I put the mod into the Vehicles folder were we used to before the New way of installing mods came about.
Thank for taking your time to read this.

 

I appreciate the feedback! I tried this but it did not seem to work maybe Its somewhere the computer cant find. The problem was still present after i deleted the fullsize folder and Reinstalled the correct ones from steam. Maybe there's something else

 

I installed it into Beamng.Drive/vehicles/ But I deleted the mod and the issue is still standing.

 

Follow this guide: Installing Content.