I own and have frequently used the following Komura lenses, all in Leica screw thread, on a IIIG body.
28/f3.5 and finder, in original semi-hard leather "case"
90/f3.5 and,
105/f2 a trully awsome and hefty piece of glass!
All in exc++ cosmetic condition, with crystal clear coated optics and multiblade diaphragms. They were all priced in the region of£35 to £65 about ten years ago. Have only shot colour with these and the results were most satisfactory.
"If the price is right" they are a good alternative to Leica's own very expensive similar focal lengths.
Give them a try if optics are clear, and reasonably priced.
Regards
Takis