I would sent the woofer and adaptor as one piece. Ive used duct tape for years to cover at least 1/2 of the speakers rear. I have used those XTC foam inserts, but you still have to cut a considerable amount so the woofer doesnt drown in the airspace.
With the adaptors, Im only looking for what I paid for the sets. $150 for the components, $50 for the rears. Again, they will come with the adaptor plates and will be ready to plug n play. (buyer pays shipping)
Again, excuse me hi-jacking your thread, bk.