Heh,
The XR6T's "spacers" are actually well thought out...
The thing that most generic spacers don't have is the lip around the inner radius. Contrary to VERY popular belief, the weight of the car is only partially supported on the studs but most of the substantial weight is actually bared through this lip.
Coupled with the fact that spacers don't have this lip, create uneven tire wear (on the street), put much more stress on your stub axles and also put at risk the longevity of your CV's and tie ends I'll stick to stocko's or fork out a bit more for the correct offset wheels
Sean