We ship a rectangular gasket that consists of 4 sides and inner magnet
DELFIELD Gasket Part # 170-1196 - Size - 20-1357 24 5/16 X 7 7/16 MAG 4SC 1701196
Models: 18691PTB, 18WC60R, 18FC78, 18660BST, 18RC68, 18RC74, 18RC99L, D4432N, F2987C, F2975C, 18FC78R, F2952C, F2996