I will be the first to admit that when I was new to this business many years ago the timing of the tailpiece was anything but common sense to me.
We do not sell these deadbolts but that problem is super easy.
See step 2 on page 7 here:
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You would order a double cylinder version of this deadbolt, you then simply order the proper length cylinders required (likely 1-7/8" length for the keyed cylinder and the mortise thumbturn if single cylinder or two mortise cylinders if double cylinder). Reach out to our sales department to confirm correct length of cylinders at the time of order.