If you are handy you can likely make both. the waterhouse stops are thin sheet brass painted black and fit into the middle of the lense, which comes out by turning and pulling. kind of a bayonet mount. Don't know if I have any for my 3b but will look. the fans are a rectangular piece of metal with a shaft that matches and press fits onto a spindle in the camera. Again I would try those brass racks from a hobby section at the hardware store. I have a few pics on my web site jamieyoungphoto.com