These printers use the 842126 cartridge:

Ricoh Aficio MP-4054 SP

Ricoh Aficio MP-5054 SP

Ricoh Aficio MP-6054 SP

Ricoh MP 4054 SP

Ricoh MP 4055

Ricoh MP 5054 SP

Ricoh MP 5055

Ricoh MP 6054 SP

Ricoh MP 6055

Lanier MP 4054 SP

Lanier MP 5054 SP

Lanier MP 6054 SP

Savin MP 4054 SP

Savin MP 5054 SP

Savin MP 6054 SP