Pretty good collection of what's needed; RM did their best.
The polymer bushings wear out the quickest; wish there were a way to buy just those. They get thin and brittle, especially the main pivots, I think because the bushings there are unevenly supported by underlying metal. Might be able to buy the bushings direct from IGUS if you can get the specs from RM. Cone washers don't seem to wear much, though I guess that might change in dirty environments with lax maintenance. The black spanner sleeve is a nice touch to upgrade from 2007's cylinder and washers, but I'd be surprised if this part ever wears out, so if you've already upgraded or have a 2008 or later SXC you'll end up with a few of these kicking around.