Lonestar Racing PRO R LOWER A-ARM AND KNUCKLE KIT With LSR Upper A arm optionThe ultimate front suspension upgrade for your Pro R! The Lone Star Racing lower A Arm kit is a heavy duty replacement for the stock lower A Arms and knuckles. Designed to be used with our adjustable upper control arms. Made from heavy duty 4130 chromoly and TIG welded. We use a vertical 1" FK uniball for the lower "balljoint" and a 3 4" FK uniball for the shock mount. We've moved the tie rod location on the knuckle to improve steering geometry and