Several years ago I got an old Airfix kit of the 88mm Gun & Tractor in 1/76 at a garage sale for the huge price of $1 When I got home I realized the tracks were missing. So the kit got built and painted and sat waiting for an idea to replace the tracks.
I dropped by my local hobby shop today. In addition to all the normal goodies, they had a small box with a bunch of small parts bagged up, most were going for a few dollars each. This included some figures as well as many armor components in several scales such as turrets and other such parts.
One of the bags contained a turret for a Panzer II as well as two fairly long tracks that looked like they would be the correct width for the tractor. Took the bag home and sure enough a good fit, in fact, 1 track looks like it will cover both sets of drive wheels. It just goes to show you should keep your eyes open when out and about.