Because the doors are so large few home centers and only some garage door stores keep many doors in stock so expect to order one instead of buying it off the shelf.
How to install a 9 by 7 garage door.
Make sure that the size of the opening matches the size of the door.
The header must be flush on the same plane with back jambs.
If your opening differs from this you may have to order a specialty door.
High by 8 or 9 ft.
Standard single doors are 7 ft.
Measure the various areas where the door will be installed.
The position of the header and back jambs are very important.
Garage doors come in standard sizes with most basic roll up single garage doors measuring about 7 feet 2 1 m tall and 9 feet 2 7 m wide.
Door opening height and width headroom from top of opening to ceiling and back room length of garage.
A standard double garage door is 7 ft.