From what I know of HG recent offerings, a few months ago incubators had a single piece of shock cord that was routed through both side channels and the quilt was free to slide on these channels.
Then there seems to be a short period when the new suspensions had separate shock cords on each end attached with lineloc 3's and a piece of shock cord in each side channel to apply tension as desired. Later (and mine is one of these) the side channel shock cords were dropped. It is my interpretation of these pieces that I added back.
I have no idea what the current version is.