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So it turns out that the OP Armor Set 3's thigh parts are compatible with 30MM lower legs.
Very useful for me, as now I'm actually happy with this leg setup in full.
Still up in the air as to what else I'm going to do with her in regards to customization, though.
Also pictured is the arm connector, which can do the exact same thing with 30MM forearms.
I prefer the left arm's setup, but it's really annoying how loose it is.