Here are 2 eyecups, and I really do not remember what they fit. One is a Mamiya eyecup, however I don't recall if it is medium format or 35mm or what. The other was in a box of Nikon stuff, and I want to say it was used with either an F or F2, but I'm not certain. At any rate, they're yours for $2 plus $2 in postage. Unless this is something you really need, domestic sale only on this, please...cash, check, money order.
Hey wait just a minute. Looking at one of these gives me an idea. What's the problem with an eye patch? Yes, of course...you can't see out of it. Well, here you go. A liberated eye patch, matey. Shiver me mainsails and all that. Just take a look at our model sporting the eyepatch of the new age. I should raise the price, but I won't. But don't tarry. I only have these two.
If questions, please ask.
Jon