Anyone have a guide on changing them?
There isnt really much to write a guide about TBH.
Its only 2 bolts on each one (13mm iirc)
I loosen one side first, then undo the other side completely.
That way there is enough movement to allow you to get it out.
Make sure you locate properly on the little tab on the bush
Before you tighten the first one you have changed up, undo the other one completely and replace that too, then tighten both up.
Ie make sure at least one is always on loosely (to stop the rack moving too much) but have the one you arent working on loosened off.
Its very simple, but just a bit of a pig to get to the bolts.