First off, if you requested brake lines and other things, that is NOT Fabtechs fault, it's the guy you ordered it through's fault.
Second, if you order a Standard 8" Fabtech lift with blocks in the rear and not replacement springs, you get 8" lift in the front and 6" in the back to level out the truck, unless it is springs, because the blocks would be too big.
Third, I have the 8" Fabtech Radius Arm lift, It does NOT have or need 18" U bolts, and yes, I have the blocks with factory springs.
Also you can't compare shocks, by the shock body length alone, you have to measure there overall travel, and extended lenghts, however it is possible to have gotten the wrong shocks, which could be Fabtechs fault or Mr Salesman's fault, depending on how he placed the order.