Can you provide a link to information about what an Unlytic or Unlitic cap is?
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It looks like the UNLYTICS are a metal film capacitor, definitely a step up from an electrolytic from a quality standpoint.
An electrolytic capacitor's main feature is that it can pack a lot of capacitance in a small package. The UNLYTICS don't seem to provide the same density.
Your current configuration consists of 4 - 1000 uf capacitors. These are wired in parallel to provide 4000 uf effective capacitance @ 350 working volts DC. Thus your replacement solution needs to come in this ballpark.
Since you can only fit one UNLYTIC capacitor in the space available, and the maximum capacitance per UNLYTIC is 1600 uf, it looks like they won't work in your application.