Based on this product's specifications, here are some alternatives and similar models
K&F Half-Frame Neutral Density 0.9 (ND8) 67mm Camera Filter, Glass, Model SB6689
Summary description:
K&F half-frame (połówkowy) neutral density filter ND8 in 67mm size (model SB6689) is a glass camera filter that reduces incoming light by 3 stops for long-exposure and motion-blur control. The half-frame (graduated) design darkens part of the frame for balanced exposure between bright and dark areas, useful for landscape, cityscape and creative photography with compatible 67mm lenses.