Will these fit my stock wheel studs?

These are M12 x 1.5 metric nuts. Check your vehicle's OEM stud pattern first—if your studs are metric M12, you're good. If you run standard SAE studs, these won't thread on.

Do I need anything else to install these?

Just a lug wrench or impact socket that fits the acorn cap. Tighten according to your vehicle's service manual torque spec—don't guess on wheel fastener torque.

Can I use these on stock wheels?

The 90mm length is designed for deep-dish and aftermarket wheels. On factory wheels with shallow pockets, the nuts may not seat properly or could protrude past the wheel surface. Measure your wheel pocket depth before committing.