First, what's wrong with the screen? Unless it's shattered, or has line faults, it will be less expensive to have it repaired than to replace it.

If it is shattered,

1. Buying the exact same model panel you now have means you won't need a new inverter.

2. Buying a different model screen that came from another 9300 means you likely WILL need a new inverter, and may need a different cable.

3. Buying any other screen (not from a 9300) means you take your chances - LCDs are not universally interchangeable and the system firmware is written for only those screens Quanta used when it built the system for Dell.

Remove the panel and look at the label with the model/Dell Part number on the back.

I would not buy a panel from EBay unless the price is half or less what a new panel costs - you have no way to know what condition it's in or how much life is left on the backlight.