That's what I was thinking too oldrev, have since found out that the use them in the Loaders and haul trucks here at the mine so I know they'll be able to cope with our lovely red dust up here!
Girt, I checked out Fleetguard, their website is absolutely appaulingly designed, but I THINK that I worked out they don't make a direct replacement for the D4D yet.
KTM.....