HP
8120-8421
is compatible in the following HP Models:
HP 2500c Printer series
HP 2500C PRINTER - C2684A
HP 2500CM PRINTER - C2685A
HP 2500CM PRINTER - C2685B
HP 2500CSE PRINTER - C2686A
HP 2500CXI PRINTER - C2687A
HP 2000c/2000cxi Printer series
HP 2000C/2000CXI PRINTER - C4530A
HP 2000C/2000CXI PRINTER - C4530B
HP 2000CN PRINTER - C5901A
HP 2000CSE PRINTER - C5900A