RPM GT2 A-arms were designed to solve several customer-related complaints about the stock A-arms. Foremost is durability. The GT2 front and rear A-arms are designed to withstand some serious abuse! RPM's redesigned the entire front end, replacing the stock front bulkhead with a version that helps spread impact forces over a larger area at the inner hinge pin mounts. RPM front A-arms are wider at the inner hinge pin mounts by nearly 3/16"? without altering suspension geometry. RPM GT2 rear A-arms are just flat-out beefy!RPM also focused on the hinge pin retaining system used on the stock A-arms. Using a small screw hole so close to the hinge pin like the stock arms do weakens the A-arms at that point. We moved the hinge pin retaining screws in-line with the hinge pins, significantly strengthening our A-arms in the process. By eliminating the smaller 2-56 hinge pin retaining screws, we've also eliminated the problem of the hinge pins falling out due to varying screw head diameters, which seems to be a rather large problem. RPM GT2 A-arms come with all necessary mounting hardware and instructions. RPM GT2 A-arms are sold in pairs while our front A-arms are sold in pairs as well and include a new front bulkhead in the package.