I buy Yamaha parts through Partzilla.com, when you click on the part number of the part your are looking at it will list all the sleds that part fits. When I click on the part number for the SRX valve it shows that it only fits the SRX's.
Theres 3 different versions/styles of valves. SRX 600 uses its own, SRX 700 Uses it own, and Viper(all 700 as far as I know) Uses its own. Flea bay sellers will tell you they are all the same and the are not!