Craig, snapshot below is from the 1929-57 Chevy Master Parts book with dimensions and part detail info. A replacement cable assembly in the 68-70"length range will fit his needs. Lots of choices out there, from plastic cable housing to steel as you mentioned. If he wants "original appearance" go with the steel housing. Otherwise the others should prove sufficient for regular use. (Just my opinion)
~ 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)