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???
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "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)