Based on this product's specifications, here are some alternatives and similar models
Folder spine Vaupe A4 50 mm green – lever arch replacement spine for A4 binders
Summary description:
Vaupe A4 spine 50 mm in green is a replacement binder spine designed for A4-size lever arch and ring binder systems. With a 50 mm width it accommodates documents of medium thickness and helps organize loose sheets into a secure spine-mounted binding. Suitable for office, school and home filing to create or restore A4 binders and keep paperwork orderly.