I bought a new hard drive, but i missed the side trays loaded with hard drive, where to buy this, what is the exact name for this?
I attached and outlined as red for your view.
Its Gamma for sure, a proud owner of one. What OP have marked in pic, comes with cabinet in a plain brown box. There are approximately 4-5 pairs of them are boxed.
Its hard to get those mounts separately. Try posting a wanted thread in TE. @vyral_143 mentioned above that he received 4-5 pairs of it, he may be willing to sell one to you. (or some other gamma owners)