Dick, I don't remember where I purchased the 1/8 male pipe fitting to the male metric brake line fitting you are looking for. I did the same as you want to do with a Wilwood Prop valve. BUT, I did find them. Measure the outside diameter of the thread, then take some threaded bolts of known different pitch metric thread approx the same diameter as your brake line thread & hold each threaded bolt male thread to match with the outside thread of your metric brake line fitting.
BINGO you know the thread diameter & the thread pitch.
When you know the thread diameter & pitch try Pegasus, Speedway, Wildwood...........
Have Fun ; )
David Dewhurst
CenDiv Milwaukee Region
Spec Miata #14
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