Noone offers a VLSD other than the sport one because what's the point? VLSDs are unreliable at best and completely worthless at worst. Unpredictable grip, no tangible way to control it, and when they over heat you're in trouble. Why are you looking for a VLSD?
If you're looking for a clutch type LSD I can help you there. I just got mine installed - everything you need to know right here:
Another OSGiken Superlock 1.5 way LSD Review...