I have just received my rebuilt steering box (BJ7) after having it coverted to RHD. The side cover can be used on both RHD and LHD boxes. The only strange thing I have noticed is that the side cover I have now is made of steel and I am sure the one supplied pre-conversion was alloy cast. Was there a change in production at some stage that they changed fron steel to alloy? Is there an advantage of one over the other? The end cover is now stamped 4 56 - does this refer to the year of manufacture ?