HDD Housing help

I have just got a new sata hdd.
I have opened my case to learn that the existing hdd sits in the housing in some sort of rail system

There are two peices of metal screwed onto the sides of the existing hdd (1 on each side), then the hdd slots onto the rail. There is space for more hdd's however i do not have anymore bits of metal that screw onto the sides.

If anyone can understand what i mean do you know where i can get the metal bits from.

I am UK based

Regards

I have found them now

Ordered them from the case manufacturer

Regards