anybody else have this problem?

bought a moog idler arm, k7042, for my 71 dart. it came with new bolt and self locking nut. installed it and the idler arm was about .060 wobble up and down, like it was worn out. tried to remove bolt and the nut galled to the bolt. sawzall repair on bolt. new bolt measured .554 in dia and hole is .574. measured 2 old idler arm bolts and they measured the same as new bolt dia, .554. went to farm store and idler hole too small for 5/8 bolt and too big for 14mm bolt. got some .010 shim stock and made a bushing and put in idler hole. tried to install bolt and it pushed the bushing right on thru. looked for some brass shim stock locally and all sometime next week. finally used a .006 brass feeler gauge and put it in idler hole and bolt now slides in and no play. what gives and what is everyone else doing with the parts they aregetting that don't fit real swell?