Ok, I can make these for $80 plus shipping.
Made of mild steel with welded-on mild steel spring loaded hinge.
Painted w Excel XL Classic Acrylic Urethane flat black (prototype pictured above is more of a semi-gloss black rattle can).
Will include a template for hole drilling, and 4 screws.
These will be hand-made but I will bolt each one to my own machine to ensure proper function.
Priced to be second from the top of the market. The top one is $99 and made of aluminum. It and mine are the only ones I see that have more than 1 bend. Notice mine has a final bend in at the very top.
Please PM me if you are serious. Thanks guys!