This waterproof cover is the 108” x 82” x 27.9” and is a great. I also linked my other waterproof cover that I use when it’s set up as a sectional. It’s the left facing 83” x 104” and is the perfect fit.

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Easy-Going Patio L-Shaped Sectional Sofa Cover, 83“X104 Waterproof Outdoor Sectional Cover, Hea... | Amazon (US)
Ruimoy Patio Furniture Covers, Outdoor Furniture Cover Waterproof, General Purpose, Outside Table... | Amazon (US)
Better Homes & Gardens B&W Stripe Square OD Throw, 21" x 21" | Walmart (US)
Better Homes & Gardens Zig Zag Stripe Decorative Throw Pillow, 18" x 18", Black and White | Walmart (US)
Better Homes & Gardens Brookbury 5-Piece Outdoor Wicker Sectional Dining Set | Walmart (US)
Better Homes & Gardens, Diamond Outdoor Rug - 7"x 10" - Charcoal - | Walmart (US)