Interesting info. Thanks. I didn't even realize cross bars came in different widths. I assumed it was a "standard" size. I guess that's my first blunder already: I'm having the Subaru dealership cross bars (I think Thule) installed THU and I don't know what length the are. Guess I'll know soon enough.
This car looks like it has factory crossbars: https://www.autotrader.com/cars-for...1=SUB&modelCode1=SUBCRSSTRK&clickType=listing