[radeonut]

Can't tell for sure if the holes in the knobs go through to the other side or not.  In any event you should be able to fill it with car bondo and then sand your way to a better look.  I do not think this will be hard to do as the basic structure of the knob is intact.

Good Luck,
Don

Thanks Don. No the holes don't go through. I was thinking of trying to fill it with something but I've never worked with plastic. The Bondo sounds like a plan.