Main Features:

                  - CNC Aluminum Billet construction with 1.75" Bolt Spacing
                  - Comes with High Temp Gasket

Oil FEED flange have 1/8" NPT Female thread. 

To adapt the flanges to an NPT fittings, please check out the AN to NPT adapter category,

https://www.fast-turbo.com/categories/Hoses-and-Fittings/Adapters-and-Fittings/AN-to-NPT/