Amazon.com: Replacement Seal Gasket, 1 set, compatible with IKEA Siphon ATLANT and DOMSJÖ, Sink Strainer Basket Replacement Part with mounting screw + nut, to screw onto strainer basket, sink stopper gasket seal :
BOHOLMEN Single-bowl inset sink, stainless steel, 45 cm - IKEA
BOHOLMEN Évier à encastrer 1 bac, acier inoxydable, 45 cm - IKEA