WTB 2x4 or 2x6 box steel

[toreadorranger]

Looking for a length of 2x4 box or 2x6 box to make a rear bumper out of for my F250.  3/6-1/4" wall preferred.  Needs to be decently long.  But would also take multiple pieces if decently long and Ill just weld them up to make the length I need if required.