Test entry covering differences between seat rails of the Z:
Left, 240Z, 1970-1973 Up to 7/73
Center 260Z and 75-76 280Z. (Date range....) 8/73 - 7/76. (?)
Right 280z 1977-78. 8/76- 78
Rear of the sliders is at the top of the picture. Sorry about that.
240z. Studs in sliders go through holes in seat base. Nut/lock/flat attach (awkwardly !) from underside of metal frame.
260/280 . Round headed hex M8x1.25 chrome bolts attach through slider into captured nuts in seat base frame.
Notes that come to mind:
Since the way the sliders attach to seat bases is different as well, I should include pictures of the seat bases, but only from the perspective of the way the sliders mount, Not the webbing, or upholstry differences. That’s another thread.