These springs will fit all Nytro XTX. These springs rate at around 2100 Nmm by the the other oem. When used on a Yamaha, he leg angle does not add as much preload, but the larger wire diamter and reduction in coils yields a stiffer overall rate than the stock 1200. 

Note: The ID of these springs is smaller than oem springs and therefore will not work with aftermarket Hygear Torsion Spring Spacers