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Mainstays 18" x 19" Tan Rectangle Outdoor Seat Cushion (2 Pack) - Walmart.com
Amazon.com: Large Seat Cushion for Wheelchairs, Office Chairs and Recliners - 19.5 x 17 x 3.5 Inch Large and Soft Cushion for Users up to 300lbs - Relieves Sciatica, Tailbone and Back