U-bolts

Does anyone know what the dimensions are for the u-bolts that go on the leaf springs for a 1974 Duster. I am positive I got 4-leaf, and the place I called has 5-leaf springs in stock, and make the u-bolts. I need to measure the specs on mine then add maybe an inch since I am getting 5-leaf. They said they can't bend the bolts until I give them the measurments. I just wanted to see if someone know what they are that way when I measure mine I know I am close. Thanks