Will these work on any vehicle with M12x1.5 studs?

Yes, if your vehicle uses M12x1.5 metric thread pitch. Verify your current lug nut size before ordering — thread pitch matters. Most modern domestic and import vehicles use this size, but confirm yours first.

Do I need to prep or paint these before installing?

No prep needed. The gold anodize finish is factory-applied and ready to bolt on. If you scratch them during install, touch-up paint can be applied, but it's not required for function.

How tight should I torque these?

Refer to your vehicle's service manual for the correct torque spec — lug nut tension varies by vehicle. Use a calibrated torque wrench to avoid over-tightening, which can strip threads or warp rotors.