To my knowledge the 10 pin headlight switches were only on early cars, to -71 or -72.
Every 73+ car I have pulled the switches out of have a 11 pin headlight switch.
Can you use an early switch in a later car? Can you use the later switch in an early car?
I looked at the '74 diagrams on Pelican, and by my count only 9 wires go into the switch. (Hard to tell for sure because the switch is on a page boundary.)
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