Banjo adapter size for cb750 oil cooler? 16mm Or 18mm?

[chlongattack]

Just purchased the oil cooler adapter from Raddaks doesnt come with the fittings. running from adapter  just going to use 3/8 male to 1/2 barbed end with clamps on a SS line. now on the radiator/cooler side i need to get a Banjo adapter to 1/2 barbed end and the screws that connect the line to the cooler. any one know what size banjo adapter i'll need as well as the screw to connect lines to radiator/cooler?