I'm lookin for a drivers seat for my 2002 roadsport,(heavy last owner).Standard black leather,i've got the runners.Anyone out there?

Also i've got a knock from the diff especially when the car/oil is hot,which would make sense I suppose.The car has only done 12.000mls,which is dissappointing,or is it normal to hear this as the diff is bolted directly to the chassis.Any info gratefully received.Charlie.