I am currently in the production phase for the latch repair kit for the F75 N75 U2 F55 and N55 Nikon Cameras. Both cameras use the same basic door although the F75, N75 and U2 have electronics on the door (For adjusting auto focus pioints etc) which make removal of the door far more difficult. The F55 and N55 have a pretty darn easy door to remove in sharp contrast. I am hoping to have these available for March sale assuming my dimensions are correct 
