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Are you are describing 3/8" X 3/8" X 1/8 outer measurements? (Which would give you inner 1/4" X 1/4" legs)
Or is it 1/4" X 1/4" X 1/8" outer measurement which effectively gives you 1/8" inner measurement legs?
If the its the 1st one I'd purchase 1/2" X 1/2" x 1/8" angle and have 1/8" ripped on both legs. (cheap and easy to find)
If the latter I'd purchase 1/4" X 1/4" square stock and have a 1/8" X 1/8" notch milled in it.
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