Based on this product's specifications, here are some alternatives and similar models
Lens Cap Canon E-82II — black, diameter 8.2 cm, replacement front cap
Summary description:
Canon E-82II lens cap is a front protective cap for compatible camera lenses. Finished in black with a diameter of 8.2 cm, it protects the lens glass from dust, scratches and light impact during storage and transport. Simple to attach and remove, it is suitable as a replacement part for lenses that accept an 82 mm cap.