The OP has 43-year-old ESS PS 5A speakers.
They have a 10" woofer and an aging ESS Heil Air Motion tweeter.
The speakers are a 2-way design, with a crossover at 2400 Hz.
The OP has replaced the woofer with a different 10" that fits the existing cabinet cutout. And now, he wants to replace the crossover capacitors.
The OP doesn't seem to be aware that different woofers nearly always require different cabinet dimensions as well as different crossovers. I say 'nearly always' only because there is a slight possibility that the new woofers' T/S parameters closely resemble the old woofers'. That's another way of saying the new woofer has little or no chance of working as a drop-in replacement. The OP also seems to have little or no experience with building crossovers. His questions about capacitors lead me to believe that.
I'm not criticizing the OP's lack of awareness. No one is born knowing things like that. But it does seem like he will ignore the above advice and push on with his rebuilding project anyway. None of us is likely to convince him it is worthless.
Therefore, I'm aiming my comment at other readers who might want to try the same thing.
That old speaker, dating from 1980, tries to use a 10" woofer in a 2-way design, crossing to a tweeter at 2400 Hz. No 10" woofer can perform at frequencies that high. I doubt if it can perform at half that frequency. Even if it can make some sound as high as 2400 Hz, it will suffer from severe beaming. It will be heard only directly on-axis. It's off-axis performance at 2400 Hz will be absent. The speaker's overall sound will suffer from a large hole in the middle. No crossover can fix that. That's why very few speaker manufacturers now try to make 2-way speakers with such large woofers. 2-way designs with 8" woofers have the same problem.
Some readers will no doubt ask why should we care, as long as the OP likes the sound of his speakers. That's not my point. I hope other readers might learn what their old speakers are & are not capable of before they try to restore their faded glory. Many of those old designs were never that good to begin with.