Hello twill220,
For the headlight, check out this site:
https://www.ricart.com/blog/2013/aug...-headlight.htm
As for the 18" wheels, it's a matter of preference. You can check out the Tires-Wheels-Suspension section:
https://acurazine.com/forums/3g-tl-t...suspension-97/
Hope this helps.