Bigboy2k

Hi, I just got a Core P8 tower and love it but I have a small problem. On the back of the case there are 3 HDD flat brackets to install your HDDs. Well I have 6 HDDs, 3 - 3.5 and 3 - 2.5. In the manual it shows that you can have a total of 6 HDD flat brackets in the back of the case but the case only comes with 3 of them. Where can I buy more of these flat HDD brackets? I have searched everywhere but can't find them on sale anywhere. Can someone please help me so I can buy more of these? Thank you! I have attached pictures to show what I am referring to.