Having looked at the pics on the banks website, it looks like an odd size - lots of pin and not a lot of bush. It might be possible to get a poly bush of a similar size modded to fit the hole, drilled to take the centre pin, and make sure it's clamped in place by the centre bolts & washers, but by the time you find a suitable bush, sleeve, make it fit, and paint it all up to make it look like a new arm, I'm not sure it would be worth the aggro.