All original SDA SRS "Blades" - best ways to refresh them?

They are in perfect mechanical condition but the crossover components are original and I suspect some of caps are gone. I read the excellent upgrade write up by "trumpeterman" here:

https://forum.polkaudio.com/discussion/173687/sda-srs-upgrade-story#latest

It seems that all the other component types - resistors, coils, do not degrade with time. Looking for recommended brands for the caps? Any other refresh items? I read that maybe the blade style SDA cable is a weak point as well. When I first got the speakers I cleaned the cable connector points and the terminal connections inside the cabinet.

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