You could try objectsonline
http://www.objectsonline.com/customer/search.php?substring=garage
or modify one of the garage doors in the AC library.
How accurate does it need to be?
Will creating a custom door panel that looks like what you want suffice?
Will adding a dummy piece above it to look like the housing suffice?
These are relatively simple to achieve. If you aren't sure how, ask with a description of what the roll-up door should look like.
Does is need to work in a movie? If this last, ask on the forum for some help or a GDL expert who could make one for you.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"