All of those seats are the original Black Lightning/Grey Flash seats and are the same seat, except for the Reg Dearden machine. They may vary a bit, but the variations are minor. The seat that 99% of folks believe is the Lighting seat is the seat on the Tony Blackstock machine that was shown in CyceWorld magazine when Bill Cottom loaned it to them. That was a Series D Black Lightning and the seat style had evolved.
David