I have not seen something like that for black iron or steel. I know you can get it in stainless steel. Worst case (I don't know where you are putting it), you can buy a T-section, and put an elbow on the end. It will achieve the same flow, but the vertical part will be offset due to the elbow.
One T and one street L.
One wall would be a bit lower than the other but would do the same thing and you aren't on the net dicking around when any corner hardware store could get you back to work.
Street elbows and bushings are not allowed for use in natural gas lines, FYI.
The threaded cross section is smaller.
