ant, that is correct, Mark was selling the kits through Ebay. That is off since he has passed.
I offer our Dyson Analysis Premium kit that is outsourced through Butler. It covers all the bases and can be ordered and reviewed at www.dysonanalysis.com
Everyone who has used that package has been very happy with its broad coverage and quick turnaround.
If you do not want our package you can order directly from Butler Machinery but that package is a standard CAT SOS kit that can be purchased at any CAT outlet.