Yes, it's replaceable. In fact, I've replaced this part along with the bar itself on some licensed floyd rose copies and it made all the difference in the world. Many copies of the floyd rose are pretty good, except the bar itself is loose, rough, or just feels sloppy. Changing this part ends those problems completely -I highly recommend this if you have problems with the bar on a floyd copy.
In the past, a new floyd rose arm would come with the threaded 'barrel', the hex screw that goes on the back, and the bar itself as a set. I'm not sure it's still sold this way, but maybe you could call or email floyd rose to find out.
Btw, my floyd rose book says to use vaseline to lube this part with, but it will wear out too fast if you use that. Gun oil or lithium soap base grease will make it last longer and feel waaayyy better! I use gun oil, because it's cheaper and less of a mess and you can also use it to clean your trem just by letting it soak in it.
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