Based on this product's specifications, here are some alternatives and similar models
Wheel Bearing for Wheelbarrow Wheels 400 mm AWTools AW91090
Summary description:
Replacement wheel bearing for wheelbarrow wheels with 400 mm diameter compatible with AWTools model AW91090. Designed to support rotational movement and reduce friction in wheel assemblies, this bearing suits repair and maintenance of garden and construction wheelbarrows. Use for restoring smooth wheel operation and extending wheel component life.