Will these fit the stock bumper without cutting or drilling?

Yes. These mount directly into the factory side marker location on the front bumper — no modification needed. Just unbolt the old marker, bolt the new one in place.

Can I install just one side, or do they need to be a pair?

You can run a single unit. Each marker is sold individually, so order left or right as needed. Many owners swap both for a matched look, but there's no requirement.

Will the smoked lens dim the signal enough to fail a safety inspection?

The crystal smoke tint darkens the appearance but the LED output stays bright. Amber still reads as amber to oncoming traffic. Local inspection rules vary — if your region has strict marker brightness rules, verify fitment before committing.