I know this is a minor thing, but I have been unable to find anything so far. The knobs in the attached picture are clearly homemade and the second set of holes tells me it wasn't a particularly accurate attempt. Which brings me to the point, what did those knobs look like? There's a bonus question, in the upper left corner you can see the threads of a rod that opens and closes a valve to send air to the defrosters, also short any knob, what should be attached to it? Thanks for any direction anyone can provide.