GMpartsdirect.com very simple once you get the GM parts numbers.. i pretty much need the lines that go from the ABS module to the rubber hoses that connect to the calipers, because i am putting the braided Stainless steel lines on all 5 of them.
these ones ZZPerformance - Stainless Brake Lines #
and the 5th ZZPerformance - 5th Stainless Brake Line #05-01-00109