ONE AFTERMARKET TORQUE ARM THAT FITS PETERBILT AIR TRAC SUSPENSIONS SAME FIT AS PETERBILT C65-6024-000010440, C65-6026-000010440, 03-04327 TORQUE ROD REPLACES ROD THAT ATTACHES FROM THE FRAME HANGER TO THE AXLE BELLOW THE SPRING. A TANDEM SUSPENSION HAS FOUR OF THEM. ARM HAS RUBBER BUSHINGS ARM IS 17-5/16" FROM CENTER OF BUSHING TO CENTER OF BUSHING STRADDLE MOUNT BUSHING ARE 4-3/8" CENTER TO CENTER WITH 5/8" BOLT HOLES IN ONE CARTRIDGE (HANGER END) AND 3/4" BOLTS HOLE IN THE OTHER CARTRIDGE (AXLE END) INTERCHANGES WITH THE FOLLOWING: SMALL EYE VERSION OF PETERBILT - 03-04327 PACCAR - C65-6024-000010440 PACCAR - C65-6026-000010440 SMALL EYE VERSION OF AUTOMANN - TMR520 CLEVITE - 924175 SMALL EYE VERSION OF DAYTON PARTS - 345-211 RUBBER VERSION OF ATRO - TR75-41440 If you have any questions you can contact us at 1 844 628 9059 between 8am and 5pm Mountain time or come by at 1030 East Commerce Drive, Suite 200, St. George, Utah 84790.