Corsair h75 installation on ryzen 1700x

Mursalin

Prominent
Apr 8, 2017
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Hello
Im absoloutely going mental over this cooler. I bough it 2nd hand 2-3 months ago but did not install it. Today i attempted to install and i already installed the radiotor and fans .I already had a wraith spire cooler installed from my previous cpu the ryzen 1600.the h75 came only with 1 backplate(also 1 plastic backplate which i dont know what its for) its a white backplate and i attempted to put it behind my motherboard but the damn thing doesnt fit.Then i tried it with my AM4 backplate which i already had . But non of the mounting plates fit on it . BTW 2 silver/grey mounting brackets but non actually fit into the backplate. I know that 1 of the mounting brackets is AM4 as i asked the seller if he had 1 and he said yes . So im wondering if i have a wrong backplate and i cant seem to find any in the UK . I would appreciate your help.

Thank you