I'm making my own oil cooler lines, but I can't find what size the inlet and outlet are. I'm looking for the Metric size and pitch of the bolt that attaches the crushed on stock cooler lines. I took the bolt to all of the hardware stores in town, but being in the middle of no where, most places don't even have metric nuts, and if they do, they don't have them this big

GO METRIC! SCREW SAE!

 

For future reference, I found out that the inlet and on the s5 intercooler are 18mm