Based on this product's specifications, here are some alternatives and similar models
Angle grinder accessory Dedra HP2107E — backing/flange plate, 25 cm diameter, 1 pc
Summary description:
Replacement accessory for angle grinders: Dedra HP2107E backing/flange plate with a 25 cm (250 mm) diameter, supplied as 1 piece per pack. Designed to fit compatible Dedra angle grinders and other models with matching mounting specifications. Used to mount grinding or polishing discs, ensuring secure attachment and even support during cutting, grinding or polishing tasks.