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X350 seats will not easily mount up. Don't know about the xk seats. 99+ xjr seats have been the most comfortable x308 seats for me, providing they were reasonably well maintained (not repacked with super stiff foam or whatever)
The later fatter wider XJR seats are really comfy. Though I find my standard XJR seats (though my car is no R but got these from the factory) to be really comfy. The soft standard seats give me backaches...