Are they all the same?? What I mean is... Is it the fittings that determine which master cylinder size they'll fit? I was looking at Russell Universal brake lines but it doesn't say anything about size.. only length... Thanks for any help...
The universal lines are pretty much all the same so you can buy whatever fitting you need for each end. When you buy the fittings for each end, you'll just need to know which size banjo bolts (10mm or 12mm) and what bend (straight, 35 degree, 45 degree, etc.).
Your best bet is to use AN-3 fittings on your masters and then you only have to buy the proper length lines. You just have to determine if you need 10mm or 12mm banjo bolts.