Winnie, they are an Eaton product, Harrop is their Australian importer.
Harrop also adapt them for some applications that the American Market does not have, eg. Nissan Patrol. The spline number on the Patrol is not in the US inventory.
Then the Retail / Fitting is handled by Opposite Lock.
I have a front one, found it to be really good, turn the switch and it works.
Had air lockers in the last car, but wouldnt go that way again, I like the simplicity of the E-Locker system.
I had no bother but know of a few who did.
Since I put the front one in I havent been stuck on a climb, but I am cautious what I tackle. Wont be putting a rear one in at the moment any way.
I had a local mechanic install it, they had a bit of trouble with the instructions I think. They were on the phone a lot.... cost me a bloody fortune. Was not happy at all, should have got OL to do it for a fixed price.