SS/B Barracuda project

I saw an reverse lock out devise, on e-bay having an "R" on the red knob. These cars don´t have any marking on the knob? Right?
I thing you can have or be without the shifter boot? I suppose most racers had the shifter mechanism covered?
Other than tachometer. Oil pressure and heat was the only instrument?

Without the rear seat, I need some more floor mats? Or was there a longer piece? Or floor pan was uncovered?