There are 4 generations of track that I know of. First was the stock American track which was replaced in the late 70s by the German Diehl 213B track. They had a problem with end connectors coming off, so had to impose speed restrictions until a newer 213G track was installed, sometime around 82. That remained the in service track on the Mii3A1 and for the conversion to M113A2. Around 2001, a company that made track for the BV206 did an unsolicited development of the rubber band type track. When the fleet was converted to M113A3 (TLAV) that track became the standard. I think there still may be the odd vehicle out there that did not get the upgrades, because I recently noted there is still Diehl track stuff in the system.
Sprockets for each brand are unique, but the roadhweels and idler remain the same. The rubber band track is extremely quiet. The vehicles sound more like a city bus that an armoured vehicle.
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