Helwig helper spring help

Hay I orders the helwig helper spring kit 981 for my 2008 tayota tacoma it didn't come with directions and only 4 u bolts, for the end of the leafs. I was wondering if I should replace the 4 u bolts around the axel. And anyone else with experience and pointers with this kit I'd appricate thanks

 

Not sure where you are in CNY, but I have a set of almost new 1251's on the back of my PreRunner. If you can get a refund for the ones you purchased, I'll give you these if they will work for you. I got new leafs going on next week and do not need them any longer. These are good for I believe 1100 pounds.