401517 - 1968-1972 GM A-Body Lower Control Arm & Adj Upper Control Arm Kit NA Miata 4140 chrome moly threaded tube

4140 chrome moly threaded tube adapters

UMI Performance solid sway bars offer improved handling and reduced body roll for a more balanced suspension

You might need to slightly modify that 3rd hole per side to use the included nut and washer hardware

This valving provides excellent low speed control with sufficient high speed forces

By doing so

401517 - 1968-1972 GM A-Body Lower Control Arm & Adj Upper Control Arm Kit NA Miata 4140 chrome moly threaded tubeThis kit includes (1) set of our tubular lower control arms and (1) set of our on car adjustable upper control arms, "Ultimate Arms". Both items are direct replacements of the OEM set up adding strength, ride improvement and most importantly, rear end adjustment. Kit Includes: 1 Set Tubular Lower Control Arms Item # 4015 1 Set Adjustable Upper Control Arms Item # 4017 Installation: Complete kit includes detailed installation instructions, uses OEM