Trying to find if I've missed a forum that caters to the 510 or roadster racers.  I ask because I have a set of NOS NISMO 510 or Roadster rear brake shoes - the Ferodo AM4 "green stuff".    Nismo screwed up and sent them to me when I ordered the 240z brakes many years ago,(20?).  They obviously didn't fit - and I never dug deep to check part numbers.  I've been toting them around all these years in the event I built up a race Z with stock rear drums,(and i just had made a mistake in my install).  Once I figured out the issue, NISMO no longer carried either set,(Z or 510's). 

 I could always do Ebay, but trying to improve my exposure and thus my return on my "investment" all those years ago! 

-Bobby

the510realm.com, or ratsun.net should suffice.