I think 4355044 looks pretty original and untouched, save for the gearbox, rear wing and driver's seat.
I never saw the car, it is just my impression from the pictures.
If it is not rusty and has so few kilometers - then it is maybe a fantastic opportunity.
Most Bats have lost their original drivers seat - the type with the adjustment wheel on the right side.
The original one looks like this:
The electric mirror is correct for this car (all Bats from 4355037 up).
Power windows are a common extra.
Most Bats started their life without a rear wing, and got one grafted later on.
This is probably what happened to this car.
It is a pity that owners (and more often sellers) always feel obliged to add wings to these cars.
Wings were forbidden in Germany, France and Switzerland.
I do not know for other countries, but I read somewhere they were allowed in Austria.
The Getrag 5 speed race gearbox was homologated for the race CSL on March 1st, 1973.
The road version became available later (1976 ?).
In their catalogs of 1974 or 1975 the "tuners" (Alpina/Schnitzer/GS/....) were still offering only the ZF for roadgoing cars.