What John suggests would work, but that would put the tail sidelights on as well, and trigger any other circuits related to sidelights.
If you want just the front sidelights, you'd need to run the relay for just those and not just mimic the sidelights switch (which may need a diode or two in the mix to avoid putting the rear taillights by feeding power back up the circuit to other things (and any interior lighting hooked into the sidelights, possibly things like cig lighter illumination, Window switches, clock dimming, etc).
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