OPTIBELT Omega Timing Belt 3mm pitch 59 teeth 9mm wide

OPTIBELT HTD

The optibelt HTD- timing belts have curvilinear, particularly shear-resistant teeth. The tooth geometry in conjunction with the belt construction produces uniform load distribution and optimal meshing of the belt teeth in the timing belt pulleys. HTD® timing belts are also available in a double section version.

optibelt OMEgA.  The optibelt OmEGA timing belt has the performance level of the established optibelt HtD timing belt and is its replacement. the belt is best for medium performance drives in all speed ranges without heavy shock loading. 

Hopefully your belt is marked, the first numbers are the length and then the pitch (e.g. 3M, 5M, 8M etc) then its the width, manufacturers usually never mark them with the width of the belt, you would need to determine this, all in millimetre dimensions.  If the timing belt isn't marked adequately, there are times when the timing pulleys are marked adequately to determine the pitch and profile of the timing belt. The pitch of the timing belt is the distance from the centre of one tooth to the centre of the next tooth.  If you can determine the exact pitch, you can narrow down your choices rather quickly by measuring the width of the timing belt and the overall length of the timing belt. Alternatively if you cannot measure the length successfully, you could count the teeth on the timing belt and multiply by the pitch to get the length of the timing belt.