NRS rockers (visually) changed a bit over the years so it's hard to describe; I suspect it's one of those "if you know, you know" sort of situations!
The long travel rockers increased the factory rear travel from 3.75" to 4-4.5"; the geometry correction permitting a slightly longer fork than the factory recommendation of 80-ish mm.
I've attached below a pic from the web with the dimensions of the SGF rockers.