I do not know what vehicle you are working on..
FWiW
I recently replaced the lines on my 93 k 3500. Its a tbi and has the metric threads. Summit and jegs have adapters to convert late model fi to an style braid or inverted flare.
I used adapters to go from factory to an to hard line. It worked good for me and was not that expensive.
HTH
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MudBird
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