Firestorm heater

Hello, i have a few questions about the firestorm compact heater. 1st of all my 14 900 XP didnt come with factory power steering, so i added the superatv one on and need to know which model i need for my unit. Second, this heater seems to be the smallest around that i seen anyways, im a real tall and big guy and my knees almost hit the center dash the way it is. If i put this heater in does it sit back under the dash a little ways or is it flush with the center dash?