At the camera fair I go to one stall holder was selling off the spares etc from a retired camera repair shop, about 18 months ago. I had quite a few shutters, there was also a box of lens elements all wrapped in their original wrapping material, some marked indicating what lens.

Another trader bought the entire box, as far as I know he still has them. I can find his details (I won't see him until July) if you're interested - he may be able to help. Let me know the diameter, he owes me a favour, and I can see if he has anything the right size, and then that matches.