I know this comes up quite often,and i mentioned it years ago but...you can make one with relative ease.
Purchase a small piece of nylon/acrylic round stock from someone like Mulford Plastics,if it's diameter is to big gently grind round in a circular motion with a bench grinder til it fits in the steering shaft,now drill the centre hole,then cut off the length req'd to finish the new bush.

Simple as,and it cost me $5.00 for the acrylic stock and about half an hour in time