Luv my 2000 XK8 (93,000 mi) but it has really gone south lately: replaced engine and many other things need work. The nav/GPS system joystick knob is gone and I need a replacement. I know, I know, I know, I should upgrade, but for now I'm keeping things original. I found two knobs: $50 and $63! As a matter of principle I refuse to pay this much for a $.50 knob. I'll jury-rig one if I have to. Any thoughts about where to find one that is reasonable?