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Update As moving onto the brakes on the other side, decided to have a look at driveshaft/doughnut on that side before ordering new driveshaft - in case I needed to order two. As I already said doughnut on passenger side appeared good previously but wanted to have a really good look in case the corrosion had got in there too. Pulled the rubber back on the un-clamped inboard side of the doughnut and could feel a bit of flakiness to the paint but otherwise looked/felt good. Was just about to decide on cutting it open when noticed that when spinning the driveshaft back and forth, there was a distinct clunk from the inboard CV joint. As there was obvious slack in the joint and would need replacing anyway, decided to cut off the doughnut. Pics below are what I found...…. Pretty self explanatory, but the pics of the doughnut cut open show that there is a difference in design/construction between the bad one on drivers side and the good one on passenger side (don't know if they are both original but suspect so). The good passenger doughnut is much more flexible when you try to turn it by hand coz the outer ring is attached to the inner sleeve by a series of rubber ribs whereas the drivers doughnut inner and outer parts are connected by a continuous rubber ring (less flexible). Don't know if this affects durability. Anyway, what was significant to me was that on the edges of the pristine paint on the driveshaft under the good doughnut, the corrosion had already started (see bubbling paint). Give it some more time and you could have another weakened driveshaft with no exterior signs . Draw your own conclusions...….