A clamp group mounting of a leaf spring to a round axle including alignment features, comprising: a round axle , a leaf spring and a clamp group connecting the leaf spring to the axle ; the axle extending laterally and having an arcuate upper surface and arcuate lower surface ; a locator ring having a fish-mouth tapered lower end , and having the lower end welded to the arcuate upper surface of the axle ; the leaf spring extending longitudinally and at least forward or rearward relative to the axle , and further comprising a bore that receives a locator element that extends at least upward or downward from the leaf spring ; the clamp group comprising a spring seat , top pad and a plurality of fasteners that connect the top pad , leaf spring , and spring seat to the axle ; the spring seat further comprising: a downward facing generally arcuate surface configured to receive the arcuate upper surface of the axle ; a recess in the downward facing arcuate surface , wherein the recess receives the locator ring that is welded to the arcuate upper surface of the axle ; a generally planar upper surface above which the leaf spring is positioned and further comprising a recess that receives the locator element extending downward from the leaf spring ; the top pad further comprising: a generally planar lower surface above the leaf spring ; an upper surface that engages the fasteners . a round axle , a leaf spring and a clamp group connecting the leaf spring to the axle ; the axle extending laterally and having an arcuate upper surface and arcuate lower surface ; a locator ring having a fish-mouth tapered lower end , and having the lower end welded to the arcuate upper surface of the axle ; the leaf spring extending longitudinally and at least forward or rearward relative to the axle , and further comprising a bore that receives a locator element that extends at least upward or downward from the leaf spring ; the clamp group comprising a spring seat , top pad and a plurality of fasteners that connect the top pad , leaf spring , and spring seat to the axle ; the spring seat further comprising: a downward facing generally arcuate surface configured to receive the arcuate upper surface of the axle ; a recess in the downward facing arcuate surface , wherein the recess receives the locator ring that is welded to the arcuate upper surface of the axle ; a generally planar upper surface above which the leaf spring is positioned and further comprising a recess that receives the locator element extending downward from the leaf spring ; a downward facing generally arcuate surface configured to receive the arcuate upper surface of the axle ; a recess in the downward facing arcuate surface , wherein the recess receives the locator ring that is welded to the arcuate upper surface of the axle ; a generally planar upper surface above which the leaf spring is positioned and further comprising a recess that receives the locator element extending downward from the leaf spring ; the top pad further comprising: a generally planar lower surface above the leaf spring ; an upper surface that engages the fasteners . a generally planar lower surface above the leaf spring ; an upper surface that engages the fasteners . <EOS>