The short side that bolts to the bracket is about 1 & 1/2View attachment 1715970294
And the long sude is abiut 2 inches View attachment 1715970293
There is a “V” in the bend likely for stiffeningView attachment 1715970295
I'm now looking at home improvement stores for L-Brackets or corner braces that are big enough where I can trim out what I need and drill the mount holes. This one has that "V" bend in it