Good morning all. The Beast is sick... I came home from the store and as I was pulling into my driveway, smoke started coming out from under my hood. It has been 100 degrees plus every day here for the last week so I thought maybe my radiator overflowed onto my turbo. Not the case... The brake lines that go from the fluid reservoir to the ABS splitter have abraded and need to be replaced. I have narrowed it down to one of two part numbers;

15869699
15869700

W BRAKE LINES (JL9);. Fits: Impala, Monte Carlo | Nalley Buick GMC Brunswick
^^^LINK

One of these go to the inboard ABS and the other goes to the outboard ABS. How can I tell which part number I need? They are both number 37 on this diagram, but there are two part numbers listed underneath the picture. Any help would be appreciated. Thank you.