Devices to couple a drive hub to a driven hub. The devices may comprise a drive hub contoured end connected to a first end of a spacer column and to a spacer drive hub flange. A portion of the drive hub contoured end may project radially out from the spacer column with a first contoured side and a first flat side and may allow movement in an axial direction and transmit torque and an axial load. The devices may comprise a driven hub contoured end connected to a second end of the spacer column and to a spacer driven hub flange. A portion of the driven hub contoured end may project radially out from the spacer column with a second contoured side and a second flat side and may allow movement in an axial direction and transmit torque and an axial load.