Quaife LSD question

SurfDog

I'm looking into a Quaife LSD and came accross this cryptic note on the Z1 site.

Quaife Differentials require no modification to install in a Base model vehicle with open style factory diff. However if your car is equipped with a factory LSD you have two possible options to properly isntall an aftermarket Limited Slip Differential:
A) Purchase a Base Model LSD and add the optional $140 Stub Shaft assmebly
B) Purchase the Factory LSD Model LSD and DO NOT purchase the $140 Stub Shaft assembly.

I have a 09 Sport with VLSD. What do I need to buy to get started on this AWESOME upgrade??????

If I'm reading it right it just means I need to buy a (more expensive $1,300) kit that allows me to install in place of my sport VLSD... is that right???

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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix