I have two tracks, 39125-3513, parts manual says this a 81 Invader track. Other is 39125-3512, witch by parts manuals says fits any invader, intruders. All measurements pretty much the same, but definetly a tread difference. Question is will the 81 Invader track work under 82 Intruder? And is this 81 Invader track more aggressive? The oo2 pic is 81 Invader track.