Steve and Richie,
Those are from the Hawk kit and there are parts of the boosters and grid on the left side. I'll post pics of the hawk kit and the helmet location tonight. Richie, call me today when you get time.
The other highlighted parts on the back look suspiciously like the two halves of the handle to the small screwdriver that used to be supplied in the 1/12th scale Tamiya Formula 1 racing car kits - I had the JPS Lotus 72D and Malboro Maclaren kits and they both had the same screwdriver (you had to assemble it before you could use it!)
The square and rectangular "plates" with the fine ridged detail look like the various radiators found on the Lotus 72D and Mclaren M23.
The curved tubular sections seem to be from the suspension and possibly cooling system i.e. on the kit they would plug into the radiators.
I will see if I can find any comparison pics but it's over 30 years since I built these kits!