Will these fit my stock wheels or only aftermarket setups?

These are universal fasteners that work on any vehicle with M12 x 1.25 studs—OEM or modified. Extended length makes them especially useful if you've added suspension lift, run wider tires, or upgraded your brakes and need extra clearance between the wheel and caliper.

Do I need to replace all four lug nuts at once?

Technically no, but most shops and builders replace the full set to keep things uniform. With 20 nuts included, you've got enough for all four wheels with spares, which is smart insurance against stripped threads or loss.

Can I install these myself, or do I need a shop?

Installation is straightforward—hand-thread them onto your studs, then torque to your vehicle's spec using a proper socket and wrench. Refer to your service manual for the correct torque value; over- or under-tightening either one can damage the stud or leave the wheel loose.