I just bought a set of sheepskin seat covers for my 1980 450sl.They seem to be of good Quality,although I would perfer they not be made in communist china.My problem is that there are no instructions with them.And no precut holes.For the tilt leaver recline knob and the headrest stalks.Is this normal.Also none of my books show me how to remove the headrest.I have to get them out to start fitting the covers.Help.Thanks Michael