The US sport model with VLSD requires one stub to be machined so it is a little shorter (not sure how much - cannot remember).
When I had my Quaife fitted, the diff-shop charged me 4-hours labour to remove the diff housing, remove VLSD diff centre, fit Quaife centre and adjust back-lash, machine one stub (the RH one as ou sit in the car - from memory, but I don't have records at work, so cannot be sure), re-install diff housing, refit stubs and half-shafts and test drive.
Since this was done whilst I was on holidays, I didn;t mind that it took an extra day to get the machining done.
It sounds to me like you can get this done by purchasing the $140 stub shaft assembly (implciation is that has already been shortened) - and using your existing sport (VLSD) diff housing - swapping out the VLSD centre and installing the Quaife and new stub and the job is done. I had bearings and seals replaced at the same time ('cos I'm a bit anal about that stuff).
RB
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