As above, I imagine if one had the parts and an HD crimper it wouldn't be difficult. My friend used Inline Tube for his 1952 Pontiac vert and they didn't fit. It was way past the date he could return them so he's looking for a source of pieces OR a vendor that would make one from his old and frayed original. Thanks folks!
I think Lokar has e-brake cables that you cut to desired length. https://www.lokar.com/assets/instructions/INS0009-UniversalE-Brakes.pdf
I cut the cables to length with my tig welder. Doesn't take much to burn them through and self cortorise the wound, no fraying or unwinding. Bit of sand / grind of any excess blob and done. Slides into the outer part effortlessly. Works on throttle cables too. Chris Chris