Based on this product's specifications, here are some alternatives and similar models
Lens and Body Cap Set JJC for Sigma SA / KPR mount (model SB1676)
Summary description:
Cap set for camera body and lens from JJC compatible with Sigma SA / KPR mount. Includes a body cap and a matching rear lens cap to protect mount contacts, rear glass and internal components from dust, moisture and scratches when storing or transporting lenses and camera bodies. Useful for photographers who need simple mechanical protection and secure attachment.