Seven and Eight Tab Headlight Switches - Which Year Uses Which?

I have one of each here that I'm going to disassemble and clean for future use.

I looked in the chassis manual but came up empty and am not about to pull my dash apart.

That said: which years use the 7 tab and which years the 8?

 

I just looked up the headlamp switch for a 1970 GS455. I got the 7 terminal,

https://www.rockauto.com/en/moreinf...TJ9gOeVJnYd8JWxS48Q8x2YUOMbyIz0co0M5bCYRWeA==

When I looked up 1971 and 72, I got the optional 8 terminal,

https://www.rockauto.com/en/moreinf...TJ9gOeVJnYd8JWxS48Q8x2YUOMbyIz0co0M5bCYRWeA==

 

When I looked up 1972, there was a note VIN code U for the 8 terminal switch. That would be the 455.

https://www.rockauto.com/en/catalog...lectrical-switch+&+relay,headlamp+switch,4472

 

Thank you, Sir!