The awnings are different. The window shade one is shorter in length and does not use the same end caps, mounts, ect. I do believe the awning rail mounts same distance…. But keep in mind 73 and 77 gmc’s have different drip rails.Do the "patio" and "window shade" awnings both use the same size roll covers?
If not, do they both mount the same distance above the side molding?
Finally, what is the distance between the awning mounts across the bow of the roof?
Double check me…. I quick looked and awning rail says 2 3/4” above the awning rail. I originally stated 2” by memory. Zip dee is an easy call.Convenient if the "top" of the awnings mount the same distance above the drip rails.
My goal is to find the length (width?) of the camber between two awnings - trying to suss useful dimensions of a "clean" roof.
As an aside, I think I'd be tempted to follow Jim B's example of two patio awnings.