Fender Skirts

These skirts were on my 59 Skyliner when I purchased it. I have never seen fender skirts that attached in this manner and the brackets certainly look like factory welds. Also they are very lightweight.
Any input would be appreciated.
I thought perhaps they were Foxcraft but I have seen Foxcraft skirts that have the same manner to attach as the factory skirts (pins on the ends and the center has a lever to tighten and hold them).
Maybe J.C.Whitney?

They look to be custom made, Foxcraft looked more factory stamped, those look like something a sheet metal shop would make.

Thanks for your thoughts on the matter. They are very difficult to put on or take off. The tires on the car when I bought it were like new but the car had not been driven in over 12 years so I purchased all new tires. When I went to have the new tires installed is when I discovered that the skirts were attached in a very unusual manner. In fact you literally have to lay on your back and slide under the car to loosen or fasten the bolts on the ends.