Metric Brake lines?

I guess there are metric brake line fittings, and SAE. Just wondering what size fittings and line you use when relocating the rear brake proportioning valve when you do a notch. I want to have everything bought and ready so I will have minimal down time on my daily driver.

they're metric & on mine i just "T"'d it & did away with the valve all together & it's been fine for years.

The stock lines are metric. I ran an adjustable proportioning valve from WilWood. I was able to run all stock lines with an adapter at the valve, since its 1/8" NPT.

Yeah, the metric lines are purple tipped. I believe they have yellow on the SAE. Just put a T where the brake line comes to the rear driveshaft crossmember and run the other line across that. Keeps it tidy!

Their 10mm x 1.0mm