stock rings == stock wheels I assume.
Should consider the rim width for the wider tires. BFG 35x1250x17 KM2 specs call for 8.5" to 11" rim width. Your stock rims are less. Can put the money for spacers into new wider rims with proper backspace for not much more. Plus get some money from selling your stock rims and tires. Even places like Discount tire will buy your low mile wheels and tires as part of the deal.
2013 JKU Sport S | 3.73 | Auto | LSD | Tow | MB TKO 17x8.5 | BFG A/T KO 285/70-R17 | Ace Sliders | Spidershade UltraMesh | Ri-Grip Hand solid front grab handles | RR bolt on rear grabs handles | Hard and Soft Tops
Husqvarna TE610 & TE450, Royal Star Venture
2009 Mazda MX-5 Miata
Ham Radio Operator K7MDL, often VHF+ rover