10. You have the option of the stock rubber bushing or a spherical rod-end style from Mustangs Unlimited. They offer the stock upper control arm axle bushings under PN F4516 for $42.95 each. These will give you a little more compliance and less axle noise, essentially acting as an isolator. We opted to upgrade to the Competition Engineering spherical bearing kit, PN C3168, for $154.95. The kit comes with a machined aluminum adapter, a spherical bearing, and hardware for both upper bushings.