Chassis Engineering offers Steel Wheel Spacers.  They are available in 1/8” thick and 1/4” thick.  Steel wheel spacers are stronger than aluminum and perfect when you need just a little more room for tire clearance. Multi-bolt pattern fits 5 on 4-1/2″, 5 on 4-3/4″ and 5 on 5″ for both 1/2″ and 5/8″ studs.