Anyone know what the benefit of changing this is, and how you might do it? Or links to any how to guides?

 

If this is the that uprates the bush, then yes this is a good upgrade to do.

And very easy to do.

Make gear changing much more positive.

Either car on ramps or axle stands, find the gear, undo one bolt, push out old bush, then replace with the two part bush, reverse unoing, job done, took me about half an hour, and I'm no expert. Enjoy