can't find anywhere to get one of these. tried the usual outlets but no joy.
Rescued attachment cable fitting.JPG

Make it ?

isn't that just a normal clevis pin assembly like you get threaded on a master cylinder pushrod, but not threaded on?

rally design under braking components?

Yacht chandlers, they use these all over rigging in many different sizes all marine grade stainless!

Caber

I made my own - spent months looking for one, then made a simple copy in an hour

(Story of my life)

like wise, my sailing dingy has these fittings, very common