Hi,
There are long front to back dividers that should have come with the Combi Sys. And there are short dividers that separate those. Also a removable bin set is available ( includes the short dividers).
You need the long dividers in order to use the short ones. If you don't have the long dividers you might be able to get them direct from Festool as a part.
Short dividers Tanos 80101823
Bin set Festool 201124
Seth