These printers use the S051011 cartridge:

ACER Acerlaser 506

Citizen Prolaser 6000

DEC DecLaser 1800

DEC DecLaser 1800-6PPM

Digital-DEC Declaser 1800

Digital-DEC Declaser 1800-6PPM

Epson 600

Epson ActionLaser 1000

Epson ActionLaser 1500

Epson EPL 5000

Epson EPL 5100

Epson EPL 5200

Epson EPL 5200 Plus