Cover is part of the oil temperature bypass valve assembly, p/n 36876787; coned shaped with four holes for mounting
NSN 6105-01-495-8922
NSN 6610-00-186-9180
NSN 5975-00-070-1139
NSN 5930-01-480-9093
NSN 5930-00-907-1113
NSN 6145-01-124-2124
NSN 5965-00-347-0231
NSN 6220-01-175-1246
NSN 5960-01-444-2205
NSN 6105-01-438-9750
NSN 5965-00-481-9737
NSN 5999-00-513-7763