Mounts to factory hinges Can be used with factory bumper and most after market bumpers without tire carriers Spacer kit allows mounting of Off-road Jack Mounting Bracket (11586.01) to Spartacus Tire Carrier (11546.50) Fits most off-road style jacks Limited 5 Year Warranty When you have the Rugged Ridge Spartacus Heavy Duty Tire Carrier and want to use the off-road jack mounting system you will need extra spacers to compensate for the additional thickness of the tire carrier. This spacer kit comes complete with spacers and mounting hardware.