steering stop

Gents, Recently picked up a set of the 2015-2021 ROUSH Mustang 20 x 9.5 Quicksilver Cast Aluminum Wheel, PART #: 421896 (+45mm offset). The tires that come on the Stage 3 are 275/35/R20. The website cautions that, to avoid front wheel rubbing, one must install the Steering Stop kit...