I can't remember how I figured mine out, nor what my garage height is. I know I figured it out somehow before I got it in there.
I can't spin mine over with the garage door up as it hits the car. My car is a '78 Trans am and it's about 6' wide I think - when I spin it over, the rear spat grazes the rotisserie center bar at the bottom, and I can't spin it all the way around with the side rear view mirrors installed. Guessing I have 7' something to the main support beam of my garage roof. Ide have to measure again to tell you for sure though.
I think mine is the one below the pro model.
I do so many different things, I forget a lot of stuff. Sorry I can't be of more help right now.
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Jon B 
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