Based on this product's specifications, here are some alternatives and similar models
Drill-hammer spindle with gear wheel TRYTON TMM1050X (model YTMM0264)
Summary description:
Replacement spindle with gear wheel designed for TRYTON hammer-drill model TMM1050X (MPN YTMM0264). This mechanical spare part restores rotary and hammering motion transmission between motor and chuck via a toothed gear, suitable for repair and maintenance of the specified power tool. Use for restoring functionality after wear or damage of original spindle components.