i have a walky diff.......i think

how can i be sure it came out of a walkinshaw.
it has 4 pinion lsd, 28 spline axles, 3.08:1 ratio.

it has a tag with a number on the rear of the housing what should this number be? or wats it for?

i have rang holden and they had no idea.....

No idea... Ring HSV, they may be able to help...

If not can someone with a walky help??