Based on this product's specifications, here are some alternatives and similar models
Mech unit spare part for Zebra label printers, compatible with GK420d/GX420d, 1 pc (P1027135-005)
Summary description:
Spare mech unit designed for Zebra label printers, compatible with GK420d and GX420d models. Supplied as a single piece (1 pc), this replacement part restores mechanical functions in the printer’s feed/transport assembly. Intended for repair or maintenance to reduce downtime and extend the service life of compatible Zebra printers in office, retail, or logistics environments.