Civic EG

Hey everybody just wanna know what is the exact thread size on d16z6 (block) where oil filter goes because i wanna buy another sandwich plate, the last one i bought of ebay had 4 adapters and the actual sandwich plate and 1 was fine for bolting oil filter on it but it didnt actually bolt on the actual block so does anybody know ?

The oil filter for our cars (and many other Hondas) uses a M20X1.50 thread.