This link sells separate chair cushions.

About materials 」

front: chenille Jacquard
reverse side: non-slip fabric
inner core filling: thick hard Cotton [thickness about 3cm]]

about size 」

left and right width 45 × front and rear 43cm
left and right width 48 × front and rear 47cm
chair cushion is trapezoidal, front width and back width

product Weight: about 0.3kg per piece

special statement 」

dining Chair cushion cover removable wash

dining Chair cushion due to manual cutting and manual sewing, there is an error of ± 2cm, please be careful if you mind