I agree with Larry. In fact, I got a kit off e-bay. Yes I was a bit concerned, but it seems to be fine, and installed ran the Tail of the Dragon, so far okay.
The kit came with the rubber and ureathane bushing both. I installed the rubber. Feel free to disagree, but I prefer the rubber for ride, noise, etc. If I was racing it may be different, but I'm not. I'm cruising. Yes, they will wear out sooner, but that's okay. I know someone who can do them again later. I just look in the mirror.