680 Koolance water block and screws for backplate

I wanted to know about if I have to buy any extra length
screws to attach the two used Koolance NX680 water
blocks I just bought and still be able to use the original
back plates that came with my two 680 GPU's ????

The used WC blocks came with no screws so I bought
a few sets from online and they will allow me to install
the water blocks on my GPU main part.

I had someone say I may just be able to use the stock
screws that came with the GPU as the side with the
back plates are not going to change at all ???

thanks for any help with this as I have everything I
need to do the WC'ing now, if I can just use original
screws for the back plates.

:bang:

680 Koolance water block and screws for backplate