$30 at most automotive parts stores ( napa, auto parts giant, auto parts way ).... u-bolts and blocks here are some links for kits
THIS ONE HAS A HUGE LIST OF BLOCKS AND BOLTS
wen i had mine made the stock is 7 and the axle is 3" so the guy cut a rod to 24" (i have 4" blocks), bent it, which stretched the rod to 25", and the new bolts are 11" tall.