Anyone know where I can buy thicker sway bars and floormats for my X?

 

Over the years the thought of alternative sway bars has come up several times.
I don't think there has been a hard and fast conclusion for an upgrade options, but this 2013 thread probably sums up your avenues of exploration. Post #8 may give you some bread crumbs to follow, but the X-Type was possibly more refined than others who produced from the similar base chassis.
https://www.jaguarforums.com/forum/x...e-parts-97175/
I think the chassis also made it into some Volvo models of the day as well.