I just lifted mine and I had to cut out all of the main eye bolts and one or two of the shackle bolts. Main eye bolts are 9/16" shackle bolts are 1/2". They're about 4"-4.5", I have both lengths because 9/16" was only available in 4". Also Lowe's has the 9/16 and Home Depot doesn't. I've heard good things about the general springs.