Fall-Line Motorsports Rear Lower Tension Arm Set - G8X | F8XMADE IN THE USA. From years of competitive race experience, Fall Line has become synonymous with producing not only championship caliber race cars but the finest suspension components that help propel them to victory. Fall Line's new F8X G8X lower tension arms are designed to make significant improvements to the cast OEM pieces; as motorsport parts, both strength, and longevity were prioritiesto do just that, the single piece Fall Line replacements