305/30/20 will fit on a 20x10.5 rim just fine.
OP this is still one of my fav 5.0's.
That's what I thought.. Just wanted to hear from the OP or any other lowered mustang owners running 20's. How comfortable the ride is? Any bump steer with running a set up like this with less sidewalk on the tires. I would love to run these rims in 19's but it's not offered. This car is gonna be my daily for a while, just wanna make sure it's a smooth ride still.