Ok well I did lots of looking around and i'm 90% sure that as Matt says, the only one that's different is the end that attaches to the opposite end of the drag link to the pitman arm i.e. left hand end of drag link.
In any event, I got all 4 from
www.mopar-wholesale.com which is a dealer in the USA, so they're all genuine parts (and stacks cheaper - all 4 were cheaper than 1 from the dealer here and handbrake shoes were $88USD compared to $500and something!!!!).
I'll install them as soon as the rest of my lift bits and pieces arrive and let you know how it goes