I've seen several Eduard PE sets of track for 1/72 scale vehicle. If you check www.eduard.cz you can search for 1/72 scale armor PE sets. The ones I have seen in the hobby shop are a set for the Revell Cromwell and Revell PzKpfw III. I was curious if the Pz III tracks could be used on the PzKpfw IV, but I doubt it.
The Pz III set fold inwards to make hollow center guides, looks like they would be neat to try.