well for christmas i got the echobit 4" shackle flip and 2 sets of ORD Zero Rate Springs. I am planning on taking out the rear 4" blocks and putting the zero rate in the back. I need to know where i can find u-bolts with that much thread and how long do i need them. Also i need some that are about 1" longer in the the front to go with my 4" springs. So where can i get those and how much are they gonna run me? Also what are the chances that i will get 5" from that flip?