Based on this product's specifications, here are some alternatives and similar models
RAM Mounts insert adapter for Zebra ET4x printers RAP-INSERT-ZE21LU
Summary description:
Insert adapter RAP-INSERT-ZE21LU from RAM Mounts is designed to securely mount Zebra ET4x series mobile printers to RAM mounting systems. The insert provides a dedicated interface between the printer and RAM arms or bases, simplifying installation and ensuring stable positioning during vehicle or workstation use. Suitable for professional mobile printing in delivery, field service and retail environments.