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Probably 5/16"
They were on my S14 so Idk why S13 would have larger.
Auto-place sells a roll 25ft of steel tube usually $20-$30, you can easily bend by hand and cut with a tube cutter, pretty standard piece. Then there are flares and fittings to deal with. I rented a flare tool and put single stage flares on the ends of my lines so I could use braided hose with a hose clamp, which is reliable and track legal.
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