A lot of fittings came with, and possibly still do, come with a big earthing screw on the body of the fitting. Big enough for a yellow crimp with a hole.
The big trouble was getting a loop in wiring system, switch wire drop and a 4mm through a tiny tiny access hole with a loose gromit.
(Gromit? Grommet?….. more cheese Grommet?)
I think I started on the 15th in 1990…. And I remember as an apprentice being told to bond everything….. I think I’ve still got some radiator clamps from that time. Instant rust spot.