the front and rear pulley combination you mentioned is 2003 XB9R and S model year only. to the best of my memory it is the only year that combination was offered as factory issued.
the correct belt part # is G0500.02A8R
you may find part # G0500.02A8 available online or at a local dealer. it is the same belt but limited warranty. the R suffix was added to the part # to signify the same belt with life-time warranty. try and find G0500.02A8R if possible.
many still available....USA dealer list price around $179