Contractor Series II 12-in LED Direct Wire Under Cabinet Light - Gloss White

I am looking for a couple 40" linking wire plugs.
Our linking cords are available in 36 inch or 48 inch through our vendor Green Electrical Supply.
Purchased 2 of these. Instructions are a bit vague for me. Which set of wires do I connect the feed to?
Please click the link below to view our YouTube installation video. UC1248 Contractor Series II LED Direct Wire Under Cabinet Bar Installation  
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