Thanks for the lead on the part!
I have the same diagram (CL-4) in my FSM and my firewall stamping matches, roughly, that configuration. However, when I look up any Nissan part # (LHD or RHD) I get the second diagram with the reversal of the bracket-firewall-master cylinder bolts.
I found this thread on aus300zx that gives a clear picture of a JDM RHD clutch master cylinder mounting, and thus, the proper orientation of the pedal bracket:
http://www.aus300zx.com/forum/showthread.php?t=330380
I also know from that thread that the LHD and RHD master cylinders mount the same as the author of the thread discovered. And all part pictures of the master cylinder on various sites (Concept Z, Z1, etc.) match that as well.
I think Nissan's parts listing may just use a generic clutch bracket diagram simply to indicate correct part numbers but not the actual shape of the part.
For reference this is a pic of a known RHD NA clutch bracket; presumably exactly what I need (the mounting bolts are reversed of the part # diagram:
http://s7.photobucket.com/user/fairladyz/media/IMG_5330.jpg.html
This all doesn't tell me though if the shape of the rest of the bracket is correct.