OUR 1958-64 CHEVY IMPALA TUBULAR CONTROL ARMS ARE DESIGNED FOR THE PERFORMANCE ENTHUSIAST! OUR UNIQUE DESIGN USES 1.250" OD DOM TUBING AND HIGH STRENGTH CROSS TUBE TO TRIANGULATE THE CONSTRUCTION ELIMINATING DEFLECTION ON YOUR HEAVY 58-64 CHEVY IMPALA! OUR DESIGN PROVIDES A POSITION FOR BUMP STOPS AND MOUNTS FOR THE OPTIONAL FACTORY SWAY BARS FOUND ON MANY IMPALAS. ARMS INCLUDE POLY URETHANE BUSHINGS TO REDUCE DEFLECTION. GREAT MATCH TO OUR TUBULAR UPPER CONTROL ARMS!