G410 disk capacity upgrade on Quantaplex T41S-TU

We have a 12 node vxrail cluster on the QuantaPlex server. we don't need to upgrade CPU and RAM, we only need to increase disk capacity. the nodes currently have 1x 400GB cache and 2x 3.84SSD capacity.

DellEMC have retired the unit and no longer supply upgrade components. We sold this as a five year solution and we are only two year into the support contract. where can get the 3.84 SSD disks to add the capacity to the nodes?

Thanks and Kind Regards