Bosch should support the old motors for 10 years, but you can't stock up on parts because they don't sell any apart from the service kit. You can only buy an exchange motor. Or you can always contact us if it's bearings or any other internal parts.Just gone and bought a mudstop yesterday - thought in the grand scheme of things that a few quid on preventative maintenance is worth it. It does look like a minor bit of dremelling might be needed on the plastic motor case to fit though.
I've a number of big bike days in the SW and Wales coming up and given the rain lately, anything to keep the bearings dry is a bonus!
On another note, given the introduction of the new Bosch motor it will be interesting to see how long official support for the 'old' model continues. Or do I start stocking up on spares now...