I ordered a NOS brass ring #303278 for my Skitwin.It has an oval hole in it and mine does not.Could not get all 4 holes to line up no mater how I tried.Part # is not different for this part so I figured no issue with the NOS one.I ended up elongating one hole to get last bolt in.No reason to suspect it will cause issue.Armature rotates and is positioned fine.