When I changed my front hubs on my 95, there was 4 nuts on each one. Each nut about 1/8" thick. Never saw that before. I think the single nuts, one time use, lock themselves by distorting the treads when 250 lbs of torque is applied. I don't know anybody that has a torque wrench that goes to 250lbs. The old way worked for many years, washer, nut, locking cap, and cotter pin, and the only part replaced was the .05 cent cotter pin. When I bought the new nuts, I still wonder why they were sold 5 in a box.