Based on this product's specifications, here are some alternatives and similar models
Chainsaw Fieldmann FZS 9030 for use with Fieldmann FZS 2105-E — replacement saw unit
Summary description:
Replacement chainsaw unit Fieldmann FZS 9030 designed for compatibility with the Fieldmann FZS 2105-E system. This spare saw module provides the cutting component for pruning, woodcutting and general garden maintenance when the original unit is worn or damaged. Intended as a direct replacement part from the same brand (mpn 50004074, ean 8590669288991).