Guys,
When I got my '99 xk8 back from repair the driver's seat now rocks back and forth on the mounting frame. It as if the seat and back are loose from the mounting. Any ideas how to fix it or what I should look for before I get into it?
Thanks!

 

First things first - Are all four bolts holding the seat rails to the chassis in place and firmly tightened? I believe they are usually Torx-40. You must move the seat all the way backward to access the two front bolts and all the way forward to access the two rear bolts....

 

Solved
Pulled the seat and turned it up side down.
The seat frame is broken! Looks like ebay will get more business.