If one side goes, i renew both sides. Simple reason being that they're probably a similar age so the other sdie won't be long and it also reduces the risk of getting two bulbs with slightly different resistances to the filaments that would bring the bulb failure warning light on.
Mine is on most of the time anyway, but that's another story............
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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