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Yes, that's where the mounting bolt goes. It's a real bitch to hold that nut still while you tighten it... Maybe someone has another suggestion, but that's how I did mine... Good Luck.
There is a self tapping screw in the hardware bag, use it instead of the bolt and nut. Some frames you have to open the hole up slightly to get the self tapper started but once you thread the frame with install the bracket. Much easier than the bolt and nut!