This holder has 1-3/4 inch (45 mm) bolt hole spacing. The bolt hole section is designed flat to fit the Bourgault and Ezee-On 47° shanks.

This holder has 1-3/4 inch (45 mm) bolt hole spacing. The bolt hole section is curved to fit all 47° shanks except the Bourgault and Ezee-On.

This holder has 2-1/4 (57 mm) bolt hole spacing. The bolt hole section is flat and has two sets of holes. The top set of holes should be used in almost all cases when mounting this holder to the shank. It fits on the Bourgault chisel plow shanks as well a

This holder has 2-1/4 inch (57 mm) bolt hole spacing. The bolt hole section is curved in order to fit any chisel plow shank other than Bourgault and Morris LH 755 shank.