chairpartsonline Replacement Armrest Arm Pad - Fits Herman Miller Ergon Chair - Non-OEM (Set of 2) S4110-1 4" Wide x 9.5" Long x 2" Tall Mounting screw holes are 5.25" (133mm) apart & are 1/4-20 threaded (hardware not included) Fit Herman Miller Ergon chairs - Versions I, II, & III with original arms Universal - Left or Right side (both are the same - Sold as a PAIR - Set of 2) Made of black soft touch polyurethane