On Thu, 08 Jul 2010 16:05:43 GMT, (Don Pearce) wrote:

Not specifically for Hitachi, but Maplin keep a reasonable supply of
square section belts. Just measure the diameter. They have (in
millimetres) 19, 30, 35, 46, 66 and 75.5

And proper electronic spares shops have a much larger selection, in a
variety of section shapes.