[72SB]

FWIW once I did find what my line size was (fittings) I bought my adapters from Amazon. They were from Inline Tube. $4-$5 each. That was for my 67 Camaro, not a C10, which was a drum/drum car I converted to disc/drum

OP, IDK what your front line fitting size is but my 67 Camaro I needed these:

One stock front line needed a 1/2-20 F to 3/8-24 M inverted flare
Rear line needed a 9/16-18 M to 7/16-24F inverted flare