short answer is it applies only to the v5, as the others do not have an LM386 in the audio chain.
if you do not use CW, or you have a keyer with it’s own side tone, it would not be an issue and you could wait for other changes. If you want CW now, Oder the part. Note that it is surface mount device.
I would look into other mods that are of interest like the age mods or digital operation, and add the needed components or wire and hardware for those if you are trying to save on shipping. Otherwise just order a selection of values pack, as caps always seem to come up as a required device in adding features to a radio.