The Seat Foam
Whils your Seat covers are soaking repair any rips or smaller tears with the Foam Glue.
Although this isn't a problem, re-glueing here will ensure that the bar stays in the foam and will extend the life of the seat.
Often the bolster at the side, or the base (especially on Sporting seats due to the design) will have splits in the Foam.
If this is the case then you have to get some of that foam glue.
Even a split this size was making the bolster sag.
The Foam Glue is great stuff, and holds very strongly if used correctly.
Spray on, allow a while to dry and then give another coat or two before joining.
I've repaired a seat on which the side of the driver's seat was basically hanging off, and it held stronger than the foam itself.
Now would obviously be a good time to repair any damage to the seat frames (Ie on older 'cinq's when the frame snaps!)