Ok. Let me rephrase the question....

Which screen numbers are most like the one that I am used to on my Mamiya TLR?

The screen that came on my 500cm seems to be pretty useless without the finder attached. I can't see anything and certainly can't focus. I would assume that I could probably only use it if I were using the magnifier on the WLF. I also assume that I am going to need a different screen in order to use the WLF without the magnifier flipped up.

I can see all the model numbers here: http://www.hasselbladusa.com/product...cessories.aspx However, they do not match with the older model numbers.

Can anyone tell me what kind of screen I currently have, so that I don't purchase something like it.