On a 68 cv. suspension rebuild, have to replace idler arm. Got a Moog replacement. Now....according to the local Mustang store, the replacements don't function right because the bushing doesn't have "sawtooth" serrated ridges on the top and bottom edges. Claims that a 65 that they did, resulted in the steering not correcting properly in turns. This was the problem. Is this true? Can't believe that Moog would not include this if it were. Still.......