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I was just about to ask the same and also for the brake cooling ducts , ford parts as on laguna seca, bought my car from dealer after someone backed out, Dealer installed ducts and splitter and of course threw box and any instructions they came with away.
I called Ford Racing (1-800-367-3788) and they sent me the instructions (.pdf)...tell them you have a 2013 Boss 302 Laguna Seca. The instructions (part #: M-LAGUNA-KITA) covers the brake cooling ducts, transmission scoop, and splitter.