viper shocks are long travel; you need longer transfer rods and longer limiter straps to use them in an SX.
The 03 Viper shocks with the part # you gave are the same as the 02 Viper shocks and will give a little firmer ride than say XTC or 2003 Viper ER shocks (which were also used for the revalve on the 02s when some said they were valved too stiff....)