No I am not wrong - you are. The XHD springs are biased, but have the same number of leafs right to left - they have diff part #s because they are diff left to right. The SS springs have a different number of leafs left to right. I know - I have a pair in my garage.
http://www.jegs.com/p/Mopar-Performance/Mopar-Performance-Leaf-Springs/747047/10002/-1