?found these on the front leaf spring mount

anybody else ever had these on the front leaf spring mount? there were 3 of these behind each of the 4 mounting bolts through the frame. im guessing the rear axle may have not been aligned correctly. but measuring the wheelbase with the shims in the left side like before it actually makes a 1/4 in difference. so we are gonna leave them out. and it should make the lengths the same.