It looks to me as if the coordinating solid arch die would be used to cut the gatefold. I don't have it so I don't know for sure but it looks as if the die cuts the curve but has no "blade" for the straight edge. If that's the case then you'd simply score your card so that it folds to meet in the middle. Looking at the measurements given for the die (5.5" x 2.1") it looks like it's designed to produce a standard 4 1/4" x 5 1/2" card. So, score a 8 1/2" x 5 1/2" piece of cardstock at 2 1/8" in from each end then place the die over one "flap" to cut it, turn the piece round and repeat for the other end.
HTH!
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