Good response from Dan. Also, it looks like the previous owner improvised and probably fabricated parts of the heater levers themselves. They should be nearly the same as all the USA delivery W108 and W109 sedans from 1968 on. They are closely the same, as Dan indicated, to the USA delivery W113 cars. The shape of the control tab is different on the slider for the W113 from the sedan versions. The USA cars after 1968 had to follow US DOT regulations and use "soft materials" for knobs etc. on the dash for safety reasons. It is the soft rubber parts of the controls on USA cars which disintegrate and fail from age. Earlier USA MBs, used hard acrylic controls which are more durable and less prone to fail. Most non USA delivery MBs of the era also continued to use the hard acrylic controls into the70's and to the end of the model run.