Take a look at the Racktime site; https://www.racktime.com/en/racktime-products/. They have a dozen rear rack baskets. It looks like only the Baskit Trunks are longer than they are wide.o
As @RTeremi suggested, you could go with the Racktime Snapit adapter and use any basket you like.
None of these is permanently mounted to the rack. They snap in with the Racktime brackets. We change ours for different errands, rides, and weather. Racktime does offer a lock for these baskets and carriers that effectively makes them permanent, until you unlock them.
BTW - We bought our Racktime carriers through online Euro bike shops. Much more affordable, even with the typical $10-$20/order shipping.
Note that the max cargo load for the Vado is 30lbs, even though the rack is stamped 20kg (I hear the Crimson Vados can carry a higher load...). We routinely hit up against this while grocery shopping.
The Racktime baskets come with the adapter installed. It's also adjustable to fit both the wide and narrow Racktime racks. The Vados have the narrow rack.
The Racktime baskets come with the adapter installed. It's also adjustable to fit both the wide and narrow Racktime racks. The Vados have the narrow rack.