Yes, I did them one at a time. The Verdictmotorsports one changed the feel but not as significantly as the 42dd ones. A friend commented that my gear shift felt quite loose compared to his when he test drove my car (this was before the 42dd ones but after the Verdictmotorsports ones). So there might have already been some degradation going on prior to fitting the 42dd ones.

Either way, both bushes combined with the pendulum mount bush (otherwise known as the dog mount insert) has changed the shift behaviour a lot and I am liking it very much. 4th to 5th is VERY smooth and I can engage it directly without having to move the shift from 4th into neutral before slotting it into 5th. 1st to 2nd is a lot more accurate than before.