[scottz]

Will these work with 3/4" clearance on each end between the outside edge of the slide flange and the bracket arm?

It seems that is what Keystone intended. Slide awnings on this unit were an option and awning rails were installed at the factory. However, the rails are only 160" long; enough for a 156" (13') awning on a 154 1/2" slide room.

If that is not enough clearance, I'll change out the rail.