I started with one from Auto Zone and after much struggling got it in place only to find that it wouldn't return to center. So, I got one from Napa swapped in (not really easier the second time unfortunately) and it was fine. They had pretty much identical warranties but the finish on the Napa box was better and the casing seemed thicker/larger somehow, but it all lined up. The Auto Zone one went back for a full refund. They tried to just swap it with another unit, but in the end agreed to give me a refund. I wouldn't go with an Auto Zone unit again.
'99 TJ Sport, 4.0 I6, 5 speed manual transmission, Hi Lift w/offroad kit, Viair 450C compressor, Garmin GPS, Skid Row Engine/Transmission, steering box & radiator skid plates, Kilby gas tank plate, AtoZ Fab full length rocker guards, Performance Accessories 1" Body Lift, OME 2.5" HD springs & shocks, JKS trackbars front & rear, BFG AT 33x12.5r15, EBC Yellow pads and Centric rotors