Can't Find Various DDS formats

I’ve been trying to export DDS files in different formats one being. “ ARGB, 32-bit unsigned sub-format” and the other being “ ARGB 16-bit unsigned variant” which a wiki told me were the correct ones for the thing I’m doing. I don’t have any ARGB option I do have an BGRA option which I think is the same but very unsure. Is there something I need to install to get ARGB or does it simply not exist?