These are the OEM part number(s) for this tool, it can be under any of the three numbers,
0317001, 334994 or CDI 553-4994 It is a reproduction and NOT an original
This locates the coil heels with the correct gap to achieve the best spark, Simply locate ring on the "bosses" machined into the armature plate, pull coils towards to the ring and tighten the coils down firmly. That is it.
Coil rings are $25 + shipping, I will combine shipping whenever possible