Based on this product's specifications, here are some alternatives and similar models
Eyecup / Eyepiece Cover JJC for Sony A1 II, A9 III, A7 IV, A7R V, A7S III — model FDA-EP21 compatible
Summary description:
Replacement eyecup/eyepiece cover JJC designed as a compatible alternative for Sony FDA-EP21. Intended for use with Sony mirrorless models including A1 II, A9 III, A7 IV, A7R V and A7S III. Provides a soft, cushioned eye contact point, helps block stray light at the viewfinder and improves comfort during extended shooting sessions. Easy to attach and removable for cleaning or storage.