Bent seat back supports

Hello all,
I'm not sure what the exact term is, but I've managed to bend the metal bits that connect the seat back to the seat post and allow it to be adjusted.
They are crushed almost flat and have bent to the right and I think if I bend them back I'll just end up breaking them, so I'd like to order another pair but can't seem to find a reference on the site. Could anyone point me in the right direction?

Here are some pictures of what I'm on about:

https://postimg.org/image/6z0tixv2r/
https://postimg.org/image/v41j0nfdf/
https://postimg.org/image/9iwgd1imr/

Cheers!
 
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