The Hellwig front (PN R-6705) and rear (PN R-6805) antisway bars for '05-'06 Mustangs come with much of the attachment hardware. Several pieces already on the car are reused; between that and what's included, everything you need to install them is at hand. Furthermore, the front and rear bars are available separately. For example, you could install just the 1-inch Hellwig rear bar on a V-6 car to augment the existing front bar, while the 15/16-inch Hellwig front bar on a GT will work with the existing rear bar. For GTs or V-6s, installing both Hellwig front and rear bars replaces both stock bars on a GT, and adds a rear one to V-6s which come from the factory without a rear bar.