OK, a determination has now been made. I have fought these covers on other builds.
I did get the dust seals out.

Soaked the forks and cleaned the top of seals best I could.

Then I looked at the spare CB160. (nice to have two huh?)
As I suspected they slide off. In this case they do not slide off. On there pretty deep I might add. Someone was in the fork area at one point.

A long way to go. Around 30mm.

Saga continues. Out of ideas for today.
tt