Synergy Manufacturing source wording says: Features: Synergy Rear Upper Control Arms for 2Door & 4Door Jeep JK / JKU / JL / JLU Suspension components feature an abrasion-resistant powder coat finish for maximum durability and corrosion resistance Made from high quality crush resistant 1.5" X .188 Wall 1026 DOM tubing Arms are bent similar to factory arm specs to clear OEM wheels with larger tires Features Synergy Dual Durometer Bushings (DDB) with Teflon® bearing surface for a maintenance free design focusing on performance, flex, longevity, and ride quality Synergy Double Adjuster Sleeve & Pinch Bolt Assembly: allows for adjustment of control arm length without removing control arm mounting bolt 100% bolt on components assures an easy, trouble free installation with the use of basic hand tools Sold in pairs Min/Max Lengths: Measured in a straight line from center of bolt hole to center of bolt hole Collapsed Length: 17-3/8" Extended Length: 18-7/8" Includes: (2) Dual Durometer Bushing (DDB) Flex Joints (2) Rear Upper Control Arms (2) Dual Durometer Bushing (DDB) Assemblies (2) Pinch Bolts & Grade 8 Hardware (2) Synergy Double Adjuster Sleeve Notes: When upgrading to adjustable control arms from cam bolts, it is recommended to replace the cam bolts with our 8014 Cam Bolt Eliminator Kit Replacement parts: Synergy Dual Durometer Bushings Synergy Forged Rod Ends with Dual Durometer Bushings Supersedes partnumber 8054 If you are unsure what replacement parts are needed for your Synergy control arms, please don't hesitate to contact us with questions!. Treat this as a support or service part until the exact parent product, install position, and required hardware are confirmed from the Synergy source page.