65 Barracuda Brake Distribution Block Woes

Are you lines stainless ? I have found some SS lines need to be really tight or use washers to seal. If regular lines check the flares and make sure they are centered and not cracked

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Honestly, I do not remember if they are SS... I am leaning more towards not. I've taken the lines off, checked over them, everything seems as it should.
Are those washers meant for only SS lines?