I just ordered a new one from Kawasaki Genuine Parts & Parts Diagrams |Ken's Sports Inc
Cost $15.00 and it was delivered promptly.
the covers are for looks,as they are sealedI bet the water and dirt makes a mess of swingarm bearings without covers. Ebay is the best place to find them, new OEMs show up sometimes. There's some on there now, brand new, but they look they've been in a dirty tool box for 15 years.
Yep, I lost mine, got a pair of new ones for $12. Had to lightly sand the inside edges so they fit the hole better, then glued with silicone. They pushed back out on their own before the sanding.
Dammit, knifemaker strikes again. I don't remember seeing "Silicone the swing arm covers" on the list, and I would have had to research a bit to figure out what you were talking about.