Carp R Us terminal tackle includes components for specific setups. Distinguish a ring for the Snag Clip system from a ring or bead used on the hook. Similar shapes do not make parts interchangeable.
Snag Clip Rings have a specific role
Snag Clip Rings have a 5 mm diameter and form part of how the Snag Clip system works. The product information specifies that the clip must be used with this ring. The Snag Clip Tail Rubber is a different component: a separate rubber does not replace the ring or clip. Check which parts you already have before replenishing them.
A rig kit or a premade link?
The Bead And Ring Kit contains longer beads described as providing more grip on long casts. The Stiff Links in this collection instead form the stiff section of the hooklink. Choose according to the missing function in your rig, then check that the parts fit and allow the intended movement.