I had a look at the spares catalogue (p.36-38 of http://cdn.sram.com/cdn/farfuture/QX..._spc_rev_c.pdf
Looks like the parts are all the same regardless of travel and the 'all travel spacer kit' (part 38) is included in the spring assembly suggesting that you can change the travel but then in the notes they say...
"6. 2012 SID 26” maximum travel setting = 120mm... Internal and chassis parts NOT compatible with SID 26” 100mm max travel.- Please note kit description travel specifications before ordering." ...which seems contradictory.
Can anyone make sense of this for me?