Randy333 wrote:
... fittingandadaptors.com

That should be http://fittingsandadapters.com/

... seems I might need to machine one,
I know the threads are 3/8-24 and 7/16-20 but I would need to know
shoulder lenghts from threrad to 45 degree seal surface.

I would take a 1/4 end from one fitting and a 3/16 from another, machine
mating surfaces on both & solder together. Rather than fuss with
cutting angles and threads.

Bob