Are you looking to install it on a Viper sled or are you trying to retro-fit a sidewinder with a viper vertical steering setup? If you are looking for the kit to do a viper, all you need to do is order the old M9000 kit from country cat, part number 5639-945 ($278) and it is dirt cheap compared to what it used to be. If you are looking at retro-fitting a sidewinder, it is a little different and I can give you the additional part numbers you need for that.
Hope this is helpful.