A bit late replying but have only just seen your posted. Did you get sorted? I changed my camera last year from a Contax and might just still have some of the bits you are looking for.
Hi Rob, sorry I`ve got my brackets mixed up with my sleeves here!!! Its a metal sleeve I`ve got which fitted over the eyepiece and the camera then fitted over the small square aperture at the end, so probably not what you`re after at all! sorry about that,