68 Barracuda Idler Loose

I had a lot of steering issues and discovered my idler arm had a HEAP of up and down movement...I shipped a brand new Moog arm out to Australia, fitted it and although better, its not as firm as I had hoped. The bush end of the arm fits in the notch ok, it came with foam style rings that I fitted both ends and tightened it up... still has some up and down movement...Am I missing something here? Is this common and is there a fix?