A clamp group mounting (10, 110) of a leaf spring (14, 114) to a round axle including alignment features, comprising: a round axle, a leaf spring (14, 114) and a clamp group (16, 116) connecting the leaf spring (14, 114) 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 (14, 114) extending longitudinally and at least forward or rearward relative to the axle, and further comprising a bore (38, 138) that receives a locator element (40, 140) that extends at least upward or downward from the leaf spring (14, 114); the clamp group (16, 116) comprising a spring seat (44, 144), top pad (46, 146) and a plurality of fasteners (48, 148) that connect the top pad (46, 146), leaf spring (14, 114), and spring seat (44, 144) to the axle; the spring seat (44, 144) further comprising: a downward facing generally arcuate surface (62, 162) configured to receive the arcuate upper surface of the axle; a recess (64, 164) in the downward facing arcuate surface (62, 162), wherein the recess (64, 164) receives the locator ring that is welded to the arcuate upper surface of the axle; a generally planar upper surface (70, 170) above which the leaf spring (14, 114) is positioned and further comprising a recess that receives the locator element (40, 140) extending downward from the leaf spring (14, 114); the top pad (46, 146) further comprising: a generally planar lower surface (78, 178) above the leaf spring (14, 114); an upper surface (82, 182) that engages the fasteners (48, 148). a round axle, a leaf spring (14, 114) and a clamp group (16, 116) connecting the leaf spring (14, 114) 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 (14, 114) extending longitudinally and at least forward or rearward relative to the axle, and further comprising a bore (38, 138) that receives a locator element (40, 140) that extends at least upward or downward from the leaf spring (14, 114); the clamp group (16, 116) comprising a spring seat (44, 144), top pad (46, 146) and a plurality of fasteners (48, 148) that connect the top pad (46, 146), leaf spring (14, 114), and spring seat (44, 144) to the axle; the spring seat (44, 144) further comprising: a downward facing generally arcuate surface (62, 162) configured to receive the arcuate upper surface of the axle; a recess (64, 164) in the downward facing arcuate surface (62, 162), wherein the recess (64, 164) receives the locator ring that is welded to the arcuate upper surface of the axle; a generally planar upper surface (70, 170) above which the leaf spring (14, 114) is positioned and further comprising a recess that receives the locator element (40, 140) extending downward from the leaf spring (14, 114); a downward facing generally arcuate surface (62, 162) configured to receive the arcuate upper surface of the axle; a recess (64, 164) in the downward facing arcuate surface (62, 162), wherein the recess (64, 164) receives the locator ring that is welded to the arcuate upper surface of the axle; a generally planar upper surface (70, 170) above which the leaf spring (14, 114) is positioned and further comprising a recess that receives the locator element (40, 140) extending downward from the leaf spring (14, 114); the top pad (46, 146) further comprising: a generally planar lower surface (78, 178) above the leaf spring (14, 114); an upper surface (82, 182) that engages the fasteners (48, 148). a generally planar lower surface (78, 178) above the leaf spring (14, 114); an upper surface (82, 182) that engages the fasteners (48, 148).