Measure your awning support slot at the top of the AS. It's the extruded bar that the awning fabric or cover slides into. That will dictate the size of your awning replacement, unless you want to get involved in changing or adding to this support bar. As 63 said, If it's a Zip Dee you can get everything you need from them. If not, Carefree of Colorado is also good to deal with if it's one of theirs.
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries