Yeah, CF official thread and all that.
I've seen one doubles bar, and it didn't exactly match the length of the pad, but the grooves were set in the correct spot. Loosen the screws on the right side of the 1P platform and the ones on the left side of the 2P platform. (But only enough to slide the doubles connector over those screws.)
Slide the doubles over the screws, and you're done.
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