Welcome, The gasket should be with the filter. This is the info I have, hope it helps. Wayne
Gasket, oil filter assembly NSN is 5330-01-200-4808 part number 102940 (Manufacturer code 73370 Fram Corp)
Oil Filter: NAPA 1004, Wix 202 C, Fram CH6PL, military p/n MS35802-2
NSN 2940-00-580-6304