I need a small number of small parts made to interface my composite stays to SS dropouts. The parts use a 15 mm diameter spherical joint to allow angle adjustments, this seems to present a problem to most machine shops. Can anyone here help?

I made my drawings in AutoCAD so they're in .dwg format, easiest for me if you can handle that but I can translate to other file formats if necessary.

17-4 SS would be ideal, 304 is acceptable.

Mods, move this to Classifieds if it's in the wrong place.