I bought the Arbiter and i already own the Avenger and fleet avenger but if i select the Avenger fleet pylons only the left one changes, the right one stays as it was, like a normal upswept Avenger Pylon.
The only way to get the Fleet pylons is to use the randomize button until there is a build with those Pylons, then change the other parts to Avenger,change Hull, Pattern and so on. A bit complicated. And i had the same problem with the old Avenger, no solution.
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