measure the new and the old this will tell you. i got a set of skyjacker extended arms and they were 15" longer. i took a 1/4"X 1" flat stock and drilled 2 holes 15" on center and installed a bolt in both ens and clamped the stock mount to the frame and used the "Jig" to get the right distance to the new mount. from lining up the front jig bolt in an old mount hole. worked fine for 2 different installs now....mike
