That one doesn't move- - - - -the crossmember and bracket holds the extension piece rigid, so the fit of the "pivot" ball doesn't need to be adjusted. The cork seal is still there, but there's no need to shim it for the proper pivot ball fit. All the vertical movement of the rear axle is absorbed by the open driveline U joint.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!