5/16 line is stock except for some corvettes, camaros and impalls ss models, they run 3/8 hard line. you should be able to pick up 5/16 steel line at your local parts store. try to run as much hard line as possible and make sure you use neoprene hose rated for atf on the rest, or you'll have a blown line on your hands in a hurry. rubber or silicone line will soften and swell if used for atf!
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