002/003 shackle problem

I think you have the answer in this pic. The passenger side leaf spring has more arch thus distance between spring eyes appear to be shorter. This only effect the rear segment of course. A spacer at the passenger side rear spring mount is probably what you need. (As some already have said)
Also important is for the SS-springs to work properly, shackle angel must be forward. Meaning lower spring eye must be rear of the upper mount hole. You may need a spacer on the left side as well. Maybe less thick though.
It´s a good thing I have a picture to show what I am talking about... right :)

spring eyes.JPG