Bruce,
I don’t think so. The E-W knobs were kind of unique in how long the stems were. The newer 300, as you know I am sure, have flush stems since the valve piece sticks out from the control panel.
I am tempted to grab that grill, but if all three knobs broke during a fall, I am guessing there is a lot more damage than that. Plus, as usual, we don't get to see what the inside of the cabinet looks like.
I have too many "Parts grills already. I have parts from a couple E series grills in totes and another partially stripped E series grill taking up space in the garage. All are sidewinders however. I just sold a Silver B today but picked another rehab candidate Silver B up a couple days ago, so I am not making any real headway in clearing space. It is going to take me 20 minutes just to get my next project (SS framed Platinum) out from under everything.