Honestly, if you're having problems with swingarm bushings fitting, etc., you could have a bigger problem where your swingarm has too much slop in it. Look in the thread under services offered, Hondaman offers to make custom swingarm bushings for your bike to ensure they fit properly and are withing stock Honda tolerences. It should run about $95 total, and you won't have to do any work besides shipping it to him. I will be going this route in January, and a number of our members already have as well.
As for Z1, they're good people, awesome service. But I do think they use the same K&L kits that partsnmore uses. Hope this helps.