you can use srx shocks on a viper with sx brackets, it will set low and you will need to set the clickers high and the preload high as well. i ran them on mine last year for a while till someone bought them. sled didnt ride as good as the long travel ohlins but it did handle like a slot car. when i changed back i was glad to have them back.
as far as the vipers on srxes, this is far from the recomended way to long travel a srx. if your just trying to raise the front you can use viper bodies and srx/sx shafts to give you 1 1/2in longer shock. bracket flip will give you another inch.
also to put the sx brackets on the viper you will need to drill and tap a hole in each side of the frame.