7.5 cm Pak 40 auf Sfl. Sd.Kfz. 10
This 1:87 scale model of a self-propelled 7.5 cm PaK 40 auf Sfl. Sd.Kfz. 10 appears to be a field modification of the light Zg.Kw. 1 t (D7) tractor, which probably never officially existed. The manufacturer of this used resin model is currently unknown. The configuration, however, does not seem entirely implausible; it roughly corresponds to the self-propelled 7.5 cm PaK 40 auf Steyr RSO/01.
Trident offers a self-propelled 5 cm Pak 38 auf Sfl. Sd.Kfz. 10, which looks to have been a confirmed field modification.