Yes and no. Mod Kits can only be used on the A40 TR Headsets. Older A40 Headsets have different (non-magnetic) ear pads, and a different headband & headband pad. However, you are able to use the swappable mic and closed-back Speaker Tags on any A40 Headset, even though the Mod Kits were not designed for previous generations of A40s.
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