If you need a knob contact Julie McCall. I get all the knobs I need from her. I won't post her email info but she goes by radiopup and her email is at this page.
http://0374e15.netsolhost.com/email_...lie_mccall.htm
She also knows all kinds of folks who deals with knobs as well. She tracked down a pointer I needed and had a fada knob I looked 20 years for. If she doesn't have one she can usually point you in the right direction.