Following up on my previous post:
Altec Lansing customer support told me today that they are to come out with an adapter for the Nano first and sometime in the future should make an adapter for the 5th gen ipods to fit the IM3. For now, they said only the IM3c version will work with the 5th gen ipods.
I had pointed out to the person I spoke with that there appeared to be a lot of 5G ipod owners not wanting to replace expensive speakers for lack of an adapter. So, based on the age of a persons' IM3, Altec Lansing may exchange an IM3 for an IM3c--as they are doing for me. Now that's customer service!