Well my dads truck is a 2500 heavy duty and he got pulled over for his lift a while back so he took his 4'' blocks off and put 3'' on. A couple days ago i found them and went out and bought U - bolts for them. Yesterdays i took one of the my blocks off and tried to put the new one on. Well..... The hole was to small. So for everyones future refrence no they are not the same haha.