I presume you're getting the folding ROPS? My
B7500 has the folding ROPS, and it's definitely
OVER 7' when in the full upright and locked position. (I'm guessing it's about 86", but I don't recall off the top of my head). I know that I have to fold it down to get it through the garage door. It's real ugly when I forget to fold it... /w3tcompact/icons/crazy.gif I only did that once, but putting the trim back up on the garage door is not my idea of usefully spent time...
Give it at least 7' width for the MMM. Go 8' to be sure, maybe you will upgrade some day?
This will also be affected by the tires you choose. I looked at a
B7500 with the Ag tires the other day, and it looks a lot smaller than my
B7500 does with R4's. In fact, my
B7500 measures 54" wide, and I still have at least 4-6 inches of width available if I slide the wheels out a couple of adjustments.