umm..  240z's 260's and 280z's and 280zx's use the SAME clutch..  as long as its a 225mm flywheel... 
  
 the 2+2 260z 280z and the 280zx 2+2 and the 280zx TURBO used a 240mm flywheel so the clutch and pressure plate is different 
  
  
 as for the throwout bearing collar.. same thing..    the 2+2  and turbo requires a shorter collar.. the standard 225mm uses the same longer collar 
  
 
  
 
 Comparison photo showing two Nissan clutch fork types used on 1970-1983 Z & ZX car models with stock Type A and Type B transmissions, with the exception of the ZX turbo models. Each type of fork was matched to a unique design of slave cylinder and push rod. Upper fork used a non adjustable design and lower used a threaded, adjustable push rod with threaded adjuster end and lock nut.  symbol indicates attachment point for external return spring used with adjustable type of slave cylinder 
  
 
  
  
 ALL pcitrues and text are courtesy of http://www.zparts.com