torsion bar part numbers

[BLADE]

I know somewhere on this suspension forum some one has the part numbers for the torsion bars. I need these numbers to verify what I have in my truck 99 silverado. It seems the driver TB is cranked all the way while the other is only half. The part numbers on the torsion bars is 1 digit off from each other. I want to get 1.5 inches of lift for some 285's I will be purchasing soon.

Does anyone know the difference between the z71 and the z71 offroad. someone said it was the skid plates but I don't think so. thank you

[Rookie]

I think they are the same. GM just changed the sticker. on the bed. i have never seen a different RPO code. Any one else???