Based on this product's specifications, here are some alternatives and similar models
Reversing ring Novoflex MFT-RETRO for Micro Four Thirds lenses — Novoflex MFT-RETRO
Summary description:
Novoflex MFT-RETRO is a reversing ring designed to mount Micro Four Thirds (MFT) lenses in reverse on a compatible camera or adapter. It enables macro and close-up photography by attaching the rear lens mount outward, preserving mechanical connection without electronic communication. Compact and simple to use, it suits photographers seeking cost-effective high-magnification results with existing MFT lenses.