Kevin,
I do have the lift in a single bay, BUT , I have a 4 car garage. It's 3 across and the middle bay is 2 cars deep. I put the lift in the single deep bay because I didn't have to deal with the garage door opener this way.. Go to this site and you can look at their tech. manual and get the exact dims.
It fits fine and if you slide the lift to the passenger side it still gives you alot of room to get out of the car. I had to move a ceiling fan w/light and put in T5's light fixtures.
http://www.derekweaver.com/html/propak7.shtml
Larry