Customadeonly 5x114.3 66.1cb 12x1.25 Studs 15mm Inch Hub Centric Wheel Spacers for Infiniti G35, G37, Nissan 240sx 350z 370z 300zx QTY: 1 Pair. Improve the handling & appearance of your vehicle. Bolt on installation for 5x114.3 66.1mm 12x1.25 application - CNC machined with precise fitment & consistent quality Made with T-6 Aluminum - CNC machined with precised fit. Carbon steel wheel studs- machine pressed (Extremely durable) Due to the fact that some of the customers are using the 15mm spacers without the cavities on the back of the wheels. The lug nuts that are given to this set up needs to sit below the surface of the lug nuts that can work with the trimmed factory studs. This sets the limitation of the height of these custom lug nuts as produced and the wrench will need to be held straight w/ thin wall socket to be able to tighten down properly. MUST READ: This spacer set includes open end lug nuts to secure the spacers onto your factory hubs. Your Factory wheel studs may extend past the surface of the wheel spacers. In this case you will need to: 1) Shorten the factory studs 2) The wheels need to have the open slots (cavities) between mounting holes. 3) Purchase a set of shorter studs and replace them&nbsp;with the factory studs