Based on this product's specifications, here are some alternatives and similar models
Hepa filter Adler AD 7961 for AD 7961.1 vacuum — HEPA filtration replacement
Summary description:
Replacement HEPA filter designed for use with Adler AD 7961.1-compatible vacuums (model AD 7961). Provides HEPA-level particulate filtration to capture fine dust and allergens. Intended for regular maintenance to maintain suction performance and indoor air quality. Easy to install as a direct replacement, suitable for households seeking improved filtration and cleaner exhaust air.