OK, with the FIS Interantional Masters being held at Mammoth in 2012, I was trying to decipher the USSA guide and also the FIS listing with regard to ski lengths/radius.
Hmmm. Thought it was straightforward and while USSA Masters is for the most part "run what you brung" I had some understanding that it would require 165 sl and 185 >27m GS for a FIS Masters event.
From the chart
"For FIS Masters Competitions, equipment rules are recommendations with the following exception: in SG races, the ski length may not be less than 185 cm for men and 180 cm for women (GS skis may be used for SG). For the FIS recommendations for ski length, ski radius and ski waist width see the current FIS Specifications for Competition Equipment."
So for FIS masters they are only recommendations as well apart from the SG length >185??