Shims/washers will be clamped in position = no wear.
The existing bushes have no evidence of wear on the mating faces, that means the bush does not move.
I'm an engineer by trade (geek with machine tools ).
Hardware (to me) is nuts, bolts, washers, shims.
Bushes are the parts that go between hardware and (in this instance) frame and shock and are usually of a softer material, in this case aluminium.
I can take pics of the bits I'd like you to measure if you like.