After some research... The VLSD uses the stepped CV spline, the plated and suretrac ones have the same CV spline each side, the circlip is inside the diff. The good news.. VSd axles will work fine in the other diffs.
The R160 axle has 2 types of CV spline.. 1 long one with 2 diameters to fit the VLSD unit, the other side has a single diameter spline.
Does anyone know if the VLSD axles will fit the suretrac diff? Thanks.