Suncast Poly Shed, Back Wall Bracket hooks?

[snopro753]

I have a poly Suncast shed that I'd like some more storage hanging solutions. The back wall has a steel c channel near the top. Does anyone know a source to buy hooks or brackets that attach to the c channel? It's circled in red in my picture. Thanks.

 

[D45]

Replace the channel with a section of square tubing with the same dimensions?

Then you can use self tapping screws and mount brackets?