was reading this from the LOC.........
A01A - 3.916 ratio Open Centre
A01B - 3.916 ratio Torsen LSD
A02A - 4.083 ratio Open Centre
A02B - 4.083 ratio Torsen LSD
So the 'B' denotes LSD.
http://img131.imageshack.us/img131/3407/vindiffcode0ig4od.jpg
A01A - 3.916 ratio Open Centre
A01B - 3.916 ratio Torsen LSD
A02A - 4.083 ratio Open Centre
A02B - 4.083 ratio Torsen LSD
So the 'B' denotes LSD.
http://img131.imageshack.us/img131/3407/vindiffcode0ig4od.jpg