Why not pull your springs and jounces and cycle the suspension to determine your bump stop extension? This takes all of the guess work out of setting up your suspension.
With 33's, OME shocks, ZJ tie rod and MC front track bar I needed 1.375" extension up front to keep the tires out of the steel fenders at full flex. In the rear (with the factory track bar w/ relocation bracket) I needed 1" extension to keep the shocks from over compressing.
Whatever bump stop extensions a kit provides will, at best, only be a conservative guess. Make your own and make them as only as thick as they need to be.
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Are you also running a body lift?