flaring stainless steel lines

Not what I'm saying at all. The 37 degree flare is if your gonna run AN style fittings, personally I like that better than the 45 double flare for brakes. The biggest difference is cost, add up all the tube nuts, flare support to help strengthen the flare and then the adapters, it will add up real quick.

Now get the stainless tubing from Inlinetube or Classictube and your set. Either one of those company's has the right stainless, it makes all the difference in the world when double flaring.

I used the stainless from both company's after I bought some from Summit Racing, that **** broke my flaring thingy that goes inside the tube for the first step. It was also really hard to cut with a 32 tooth saw blade. The point is, either way works fine, just use the proper kind of stainless. Hope this helps some.