About the "headrest"; I can NOT use a headrest in my 1973 Porsche 911 RSR project as I have to duplicate the 911 RSR project exactly as the Porsche factory built it, down to every single exacting detail of a 1973 RSR. This goal is why I have asked you so many questions about your Recaro bucket seats and the correct seat-rails. Again, I am sorry for being so "picky".
If you have one complete set (4 pieces for one bucket seat) of the correct Reccaro seat-rails used by Porsche in the 1973 Porsche 911 RSR, I will take them. Can you please email me at least one photo of the 4 pieces you have?
I can look for a seccond seat for you. These seats are very rare and many people ask me about them. If I find one more, I will send you an email. I am buying seats all the time but can't say when somebody will offer me the next RSR drivers seat.