Do Sealed Contactors Need Snubber Diodes?

I'm trying to replace a very old Albright contactor, the kind that is open to the air and is a possible museum piece, with a new Gigavac GX series sealed contactor.
The Albright uses a diode to absorb inrush currents. The Gigavac documentation says no diode is necessary. But deep in the documentation it does mention that some customers with Curtis controllers have had issues. I have a Zilla. Because the contactors are sealed, there's no way I see that you can add a diode.
So, if you've got an old-school controller with giant capacitors can you use a modern sealed contactor? Or do you have to work around it?
Thank you.