HP Z800 SAS drive and adapter does not fit in bay

Purchased a refurbed Z800 system as an upgrade to a XW8600.  Have used SAS drives in my XW8600 before.  Using the HP SAS adapter 398291-001 (grey) and a Fujitsu mba3073rc drive I put it in the HP Z800 caddy and slid the drive it.  The drive does not mate up to the cable assembly at the back of the workstation.  Am I doing something wrong?

Thanks.