Here's how I fit 305 square on my non-widebody Challenger Scat Pack:

PARTS
* Konig Ampliform 20x11 +21 - https://amzn.to/3hNkJnJ
* Continental ExtremeContact Sport 305/35/20 - https://amzn.to/3fSuLT5
* 26143B - Pro Comp Wheel Lug Nuts - https://amzn.to/315XpLY
* Dorman extended studs (optional) - I don't have a link anymore for these.
* TPMS Sensors - https://amzn.to/2Yi06IU
* 12 mm hub-centric spacer - https://ebay.to/2QeeBuN (should be $38)
* Eibach Pro-Kit - https://amzn.to/2AQfO4M

ROLLING/TRIMMING
* Roll ~5" of front fender (minor)
* Trim ~4" of rear fender liner

Please note some links above are affiliate links. This means that if you purchase a part from a site I list, I will receive a small percentage (2%) of the sale. I purchased most of my parts from these sites, but I urge you to explore other sites for better deals. The affiliate links are a way for me to recuperate some of the costs of experimenting with this set up, but please do not feel an obligation to use these vendors if you can find a better deal elsewhere.