Subject: Converting original P80 Lamps for use today?

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As some of you may know, I intend to replace the P100 lamps on my car with P80s. I know that originally these lamps had a solenoid inside one lamp that dipped the light, the other remaining static or extinguishing - I'm not sure which.

Either way, I assume that for modern use one needs both lamps to dip so, in Lagonda circles, what is the accepted way of converting these lamps?

Reason for asking is that I may have located some suitable lamps but only one dips.

Thanks Rich...