How to tighten seat bolsters?

Maybe it is a stupid question and I am sorry in advance, but how do you tighten up the seat bolsters? One of each side are a bit loose. I couldn’t figure it out how to tighten them. Thank you

 

Just need to take seats out and look from underneath. You’ll see the fasteners, not the best design. You’ll also see how the front bolster part can be extended. There’s threads on whether our seat front edge can be extended or not - turns out they can.


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The front center can be extended?? Really? I had no idea.
But I am talking about the bolsters of the back rest not the ones at the bottom, for those I need to remove the seats too?? Thanks

 

I don't remember if I could get to the fasteners without pulling up the rear panel on back of the seat. I think you def need to remove the seat. Its easy though. A few Bolts.

 

Between bolster is small metric Allen screws. Put finger in to move bolster aside.