L19W2120A: HP M554/M555/M578 BLACK TONER (5.5K), 5500 pages

    L19W2120X: HP M554/M555/M578 BLACK TONER HY(13K), 13000 pages

    L19W2121A: HP M554/M555/M578 CYAN TONER (4.5K), 4500 pages

    L19W2121X: HP M554/M555/M578 CYAN TONER HY(10K), 10000 pages

    L19W2122A: HP M554/M555/M578 YELLOW TONER (4.5K), 4500 pages

    L19W2122X: HP M554/M555/M578 YELLOW TONER HY(10K), 10000 pages

    L19W2123A: HP M554/M555/M578 MAGENTA TONER (4.5K), 4500 pages

    L19W2123X: HP M554/M555/M578 MAGENTA TONER HY(10K), 10000 pages