This airspring is a custom Air Spring we designed with all you GM guys in mind. The built in brackets are designed to bolt into most GM cars with trailing arms. This airspring has a 1700lbs capacity at100PSI Min Height: 5.25 inch Ride height: 8.5 inch Max Height: 12 inch Bag Diameter: 5.875 inch Air Fitting Port: 1/4 inch NPT Note for airsprings: An external bumpstop and an extension stop (limiting strap or the shock absorber) Must be used to prevent the airspring from exceeding the compressed or extended dimensions. If these dimensions are exceeded, severe damage to the airspring, and possibly the vehicle, will result.