https://www.mccoys.com/shop/p/3730629-052303-24/harvey-020500-gasket-kit
Includes three squares of gasket material such as one natural red rubber 3/32 in thick, one black fiber of 1/32 in thick and one cork/rubber of 1/16 in thick.
Includes
(1) 6 x 6 x 3/32 in Red Rubber Sheet, 1/16 in Thick Rubber Cork, 1/32 in Thick Black Fiber