You're looking at the "driver" seat of a factory built 1973 Porsche 911 RSR. Now, notice how the two Recaro seats are different.
The driver Recaro seat has a more pronounced lateral-support contour while the passenger seat does not.
Contrary to what many believe, the 1973 RSR used two different Recaro seats in each car.

Take a quick look here http://www.pbase.com/slidevalve911rsr/image/54175395 and note the same seating configuration
but this time on a "right-hand" drive 911 RSR.