Plastic rear lens caps depth 13mm for rangefinder Nikon S 35mm f/2.5, 35mm f/3.5 lenses. Also you can use for Zeiss Contax rangefinder camera lenses and Russia Kiev camera some lenses which rear lens deepth < 13mm. See the picture.

These are generic covers not made by Nikon. 

Good luck and thank you for bidding.