These printers use the S051016 cartridge:

Epson ActionLaser 1200

Epson ActionLaser 1600

Epson ActionLaser 1700

Epson ActionLaser 1900

Epson C 205023 J

Epson EPL 5600

Epson EPL N-1200

Epson EPL N-1200-12PPM

Epson LP 1600