Thanks  Those are metal Friul tracks, the first (and only) set I ever used These Japanese tanks are known for having relatively loose tracks, and my kit only came with single-piece tracks that would be very tight. The only alternatives I could find were these and a set from Model Kasten, so I decided to try Friul.

The more recent releases of these Fine Molds kits have link-and-length tracks with sag already moulded in, I learned on another forum.