You should be able to find a resistor by Googling the part number. I guess you'll want No: 2 for premium fuel with Cat. There's one here:Ok, so can I get a resistor or do I need to get a whole new ezl?
1990-2002 Mercedes-Benz Adjustment Connector 015-545-67-28 | Mercedes-Benz Parts
1990-2002 Mercedes-Benz Adjustment Connector 015-545-67-28
The car will run fine without the resistor - I can barely tell the difference.
I'll be optimistic here and say that, if the car starts, your EZL is OK. That has been my experience over 24 years with the same car - same engine as yours.
If you can find another EZL, I recommend that you put one in stock. They are increasingly difficult to find and costly - well over 1000€ in Europe and 2300€ here in rip-off France.
Also, don't forget a thin, even layer of good quality heatsink compound between the EZL and the bulkhead - nice clean surfaces too. You don't need any foil layer either.
Good luck - nice engines when they're working correctly.