Go to the dealer and make sure you have the length of awning with you. If you can leave the old brackets and supports on the unit as there is not much to bolt to when installing. You can replace the old arms etc. with new but if you can get an exact fit it is better. I have replaced a few with neighbors and it is a two person job because you have to feed the new into the old track if it will work because of the length but not that hard to do.
Dennis and Lorraine, old at camping only: