brake question

Hi guys I am building a 36 chevy and starting on the brakes. I have a new master cyl. with 3/8 24, ports and a proportioning valve from a camaro. The front is no problem it is all 3/16" line. However the rear section of the valve looks to be metric 6mm o.d. lines. Does anyone make adapters from metric to npt. Thanks

 

http://www.godmanhiperformance.com/

 

Winners Circle in Joliet would have them.

 

I've had good luck at Napa for "odd" fittings