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Sofa cushion replacement

3+1+1 sofa. Need to replace seat foam/cushions. Big sofa has 2 big size foam seat and one each standard size foam seat on single seater. We are using the same tapestry. Big sofa is folding sofa bed and seems to be sinked little bit. May need some adjustment or may be replacing foam might do the job. Also a small stitch below the cushion to cloth over frame