Spike2Me

I purchased a new computer thru Cyberpower PC which incorporates a Thermal Take Core G21 GE case. There is space to put in two 3.5" HDD's or two 2.5" SSD drives. The computer came with one 2.5" SSD and one 3.5" HDD. I am trying to add at least one more 3.5" HDD. I was successful removing the SSD and using the Hard Drive mounting plate to install the second 3.5" HDD. I need a third Hard Drive Mounting Plate to install the SSD. I have worked around it by using Velcro, but I would really like to secure it to the case with the Mounting plate, do you kinow where I can get one?