The 819 OE is 1200 all the way around, it is not only the offset but a wider rim as well, The spacers go on the hub front/back then the tire/tires, NOT between them.
This is why I say G172 1200rs would be perfect for the front, What is the weight rating for these ??? 1200 ndts are very hard to find, I have 13 (had 14 new but air operations took 1), do not/won't run them on the front due to the HEAVY front axle load (just under 14,000 lbs) and the fact of air op. along with a second front tire (1100r) detonation.
Right now I am running 1100rs (G177) on the front along with a dropped front drive shaft, the military had done the MWO for the front sprag but did it DIFFERENT, worked fine till one of the popped valves started to leak, then about burnt up a front axle.