When working on the electrical system all in a sudden the head light doors opened and did not close again. Strangely enough the light switch was not touched at that moment.
The problem now is that the headlight doors and low beam lights are not working when turning on the light switch. But...
If I am correct this vacuum advance is for a 69 chrysler 440. Just bought a NOS with the part no 2875761 on it. (refer to parts manual text page 8-17). It's also stamped with 12L.
Let me know where you bought an after market replacement.