You can get them at "Autismzone" but get the part numbers off the online store before you go to store - they are usually stocked items but the brain dead that work behind the counter can never find the part number or listing.
Second I have popped the end off the main cable twice now in the last six months - apparently this is common to the MJ as everyone I see in the salvage yard has broken cable end. (Is there a solution for this or should I attempt to fit cherokee hand pull brake since I have the bucket seat model plus this would give more control when wheeling?)