The bases AA sold as an option were made by Sound Anchor. When I called AA they no longer stocked them and they got me in contact with Sound Anchor which they made a set for me at the original price. Same ones as on this link.
https://www.audiogon.com/listings/full-range-w-sound-anchor-stands-2017-10-05-speakers
If you’re not using spikes it does make a difference for the better.