Looking for parts for a 1960's Magnavox Astro-sonic console

I have a 60's magnavox record player and am looking for a place or person to get parts from . I just purchased a needle but realized i didn't have the counter balance weight that goes on the back of the arm. It was a Goodwill find but in excellent shape. If you or you know a website I can buy parts for this thing that would be great. Thanks for your help.