Are the cylindrical filters found in the PSE 420 mini lightbar the same as those found in the MX7000 or Excaliber lightbars? In other words, are they interchangeable?
In that bar yes. The rotors in your bar are known as the freeform style which I've seen used in MX7K bars as well as factory modified XL5K bars. I currently have 420 bar that has your same rotors.