Based on this product's specifications, here are some alternatives and similar models
Toner cartridge Quantec TON-1690 black replacement for laser printers, compatible with model 5550
Summary description:
Replacement black toner cartridge Quantec TON-1690 (for model 5550). Designed for monochrome laser printing, it supplies black toner for document and office printing. Suitable for users needing a compatible consumable for maintenance and continued operation of printers listed as compatible. Practical for printing text documents, reports and everyday office tasks.