The heater levers on the 107's are chrome and slide up and down, correct? The sedans are a rubber/plastic composite and slide side to side. The internal operations may be similar though. Now if this was a 108, I could walk you through the fix.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.