Found 2 "maybe" possibilities, but both sources seem to only offer the in-cab line and the below cab to fuel pump line together as a set. The shorter lines in each source pics seem to look similar to the line that is pictured in the FAM. Maybe worth a call to the vendors to see if they would sell just the short in-cab line??? headscratch

SS Tubes (coated mild steel)

Classic Tube (stainless steel)
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)