Last years Reba’s (and earlier models) had 120mm travel but i believe 2012 onwards are 100mm only with the new Revelation 29ers coming in at the 120-140mm travel.
On One were knocking out 120mm Reba RL’s a few month ago (and i just missed them) but they’re now like Rocking Horse poo…..
I ended up buying these:-
http://www.29squadron.com/product.php?id_product=102
They seem to have one set left (on sale) and were pretty good to deal with. A word of warning though – 2011 and before Reba lowers seem to have a common problem with being slightly offset (QC problem) meaning that you may be restricted to running 2.2″ ish tyres max as a 2.4″ rubs the disc side lower. My 2009 non tapered have this problem and so do my new ones like above (although Sram UK warrantied them with new lowers in 48 hrs but the new lowers were only a bit better than the old ones and still don’t fit a 2.4″) I started a thread on it if you look at my forum history. In practise the forks still work great, but if you want to stick a fat tyre in then go for 2012 Revs (where apparently the problem has finally been sorted) or stump up the cash for a set of stanchion munching Fox.
And don’t forget you can always get Manitou’s in 120mm and i think Marzocchi do one as well.