Army consists of 4 x 4Kn, 7 x 2LH and 1 x 3Ax.
Here are the knights. The figures are actually Magister Militum Sarmatians, but they do the job - close packed, fully armoured hooligans on horses.
These guys are the Light Horse archers, these figs are again Magister Militum Hun figures. Not particularly Parthian, but my argument is that they are Chionites, who were a Hunnic related people who came within the Parthian empire. The auxilia element is made of Essex Cuman javelinmen. Again, not especially Parthan, but look OK for Kurdish Hill Tribes, who also fell under the Parthinan sphere of influence.
So there you have it, and entire Parthian army with not a single Parthian figure amongst them!!!