The OEM hinges on all GM truck's & suv's are welded on. This means that they have to be removed (cut) from the frame. Once they are removed you will have to drill holes to install the Vertical Doors Inc. coversion kit. Made and manufactured in the USA. Includes: (2) Gas Shocks, (2) Vertical Door Conversion Hinges, All Mounting Hardware, Instructions. Description: The Vertical Door Conversion Kit complements your car with their patented direct bolt-on technology. Vertical Doors kits are made and manufactured in the USA with top-notch standards in bolt strength and industrial durability. Complete reversible installation is also available. Once installed, Vertical Doors maintain the vehicle's proper factory door seal, ensuring a leak-free and noise-reduced ride. Features: Each Vertical Door Conversion Kit made by Vertical Doors, Inc. is specifically made for that application. The hinges and shocks used for that application are not used for another like most knock-offs you see out there for half the price. This pivotal Assembly System replaces your stock hinges. Warranty: The pivotal assembly system is made of High Strength ASTM Hardened Steel, and Vertical Doors, Inc. offers a Full Lifetime warranty on the Steel. The shocks (6 month warranty) are gas charged according to each vehicle. They have the perfect pressure for each individual make of vehicle. The shocks are warranted as long as you keep the original invoice.