Matt
CV do native kiev/Contax/Nikon rgfdr 21, 24, 28 and 35mm lenses, they are registered for the Nikon rgfdr (51.5mm) and coupled but will work on the Contax/Kiev register (53mm) ok, as the deviation is not significant for a 35mm or shorter & slow lens.
As well CV do NIKON F SLR 12 and 15mm lenses, with an option of Leica or Nikon/Contax rgfdr registered adopters, no coupling, - which will scale focus normally.
Russ the Canuck Kiev survival site maintenance man may have all of these.
They are all remindered, no longer in production, when they are gone they are gone...
Noel
P.S. sorry Vince I ment to type 35mm