need help with axle I.D.
 

I know the axle is from A 81-87 , 10 BOLT.(actually this particular one is a much rarer 88-91 30 spline, but you know what I mean by 81-87) It is 30-3/4 from the end of the splined area (not the very end of axle) to the INSIDE of the axle flange. I don't know whether it is a left or right ? are they the same on the 10 bolts? thanx for any help with ID. Crossy