The ADIS16445/PCBZ comes with (1) ADIS16445 IMU, (1) flexible connector and (1) rigid PCB. The following three pictures describe how to connect the flexible connector into J3 on the rigid PCB. NOTE: This applies to the ADIS16448/PCBZ and ADIS16334/PCBZ as well! I hope that this helps!
Rigid PCB, along with a red box to identify which 20-pins mate to the 20-pin flexible connector interface
Second, here is a per-insertion view of how the flex will look
Third, here is a zoomed view of this view!
I hope that this helps!