Pallet/slats/frame for double futon (Hanover BN2)

hey! if anyone has literally any sort of pallets/slats/frame like those pictured for a futon mattress base (to be used as a nightly bed) - I would super appreciate it! or if you have something else that would work for a futon mattress, I'm open to any ideas and happy to collect as long as it fits in a hatchback! thanks!