I thought the 4 hole return rollers where used only by the swiss army!!!! The last return roller design from the WH was the one with more than 4 holes .....
Ci vediamo
Daniela
Dove c'e' da Rievocare noi Rievochiamo - Dove c'e' da Ricostruire noi Ricostruiamo
This not quite finished (!) Hetzer was driven out of the Skoda factory by partisans during the 1945 Prague uprising and you can clearly see the 4-hole idler, rather than the more common 6-hole 'round' style.
I would imagine that as this is the dying days of the war this became the default style for the postwar G-13s?
Can't see any return rollers under the side skirts but would expect to only find one! (Saving valuable materials and all that)