Doing a little digging on the net reveals that some reboxing takes place at the zone. I believe that their suspension stuff has a lifetime warranty as well. I could be wrong though.
McQuay-Norris, TRW and MOOG where listed in my quick searches as reboxed Duralast items. maybe they have them in stock for you to compare.
Good Luck
Tom
No more death shake, err rattle(wobble) or whatever you called it. Sounds freaky!