My cooler doesn‘t fit

Hey, i could need some help! I bought an NH-15 secondhand to replace my trusty NH-U9S. But: the Bridges don‘t fit right! I simply can‘t get them in the right Position(As per the second manual screenshot). They arent wide enough and i can only fit them on like in the image that explicitly states NO!

In the instruction manual all the images read IMB2-v2 while mine only read IMB2. That can‘t be the issue right?

Any help is appreciated!