On Feb 21, 9:37*am, MatthewK wrote:
I need some u-channel that is an odd size. I want the stock to be about
1/16 inch thick or less and the dimensions would be: 1/8" x 3/8" x 12"

Square brass tubing is a common hobby-shop item; my old
Small Parts catalog lists 3/8" square with .028" wall,
you could saw a length into two channels.

Some aluminum extrusions (like for picture frames) could
also be suitable.