I have just changed my A-frame bushes for Powerfelx ones. Yes you do have to cut them down a bit - but because they are polyurethane they should last longer. Also Demon Tweeks sell them in a pack of four - so you have a spare pair ready for the next time they need changing.
I am interested to learn more about a rose joint conversion on the rear A-fram bush, does anyone have any experience of this and can it be modified easily?
Hubcap