wheel spacers

I have a 2018 trd sport all stock what size of wheel spacer can i use and not rub.

 

This question doesnt make sense since you state that your truck is all stock, they dont rub when everything is stock unless something youve damaged something. Is something rubbing with your stock setup? Stock would be the same size tires as from the factory, different knobby tires sure but not larger size. Are you planning on getting oversized wheels? that would cause it to rub if you go big enough, if you are planning on going oversized tires what size were you planning on?