I wish I could get a good face-on view (scan?) with dimensions, of that old extrusion. It'd be fun to 3d-print a clone; of course it won't look the same but it would get some stuff in the right approximate shape.
Guess I should probably buy one, cad it up, and sell it again.
If it's just that classic style you are looking for, and not the exact Hayes design, you might find interesting options from Protocase, Metcase, Bud, or one of the others:
Guess I should probably buy one, cad it up, and sell it again.