See the wrecked image in the thread below; although it has lost all its return rollers the bolt holes show they were in the 3 roller configuration.
http://www.network54.com/Forum/47207/message/1094818501/VORSATZ-P+use+on+Panzer+IV-70+%28A%29+and+Panzer+IV-70%28V%29+-+long+text%26amp%3Bimages
If you want to get hold of theses images they are in my own vol5 and also PW1.
craig (8wheels-good)
http://8wheels-good.blogspot.co.uk/