This is the one I bought recently. It is perfect for X-Pro1 camera, fits as original. As you can see it should be for old Nikon F/F2/F3 series, and you can find it on ebay,or maybe in your local store too; but I am from Croatia, so this was my only option.
Good luck, r
http://www.ebay.com/itm/191437159977?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT