They should fit just fine, you screw the brackets to the fan and it just snaps onto the heatsink. Did the same with some antec fans. Coolermaster also sells a matched fan for that heatsink, but you need your own splitter for ithttp://www.newegg.com/Product/Product.aspx?Item=N82E16835103069
got a picture of this misalignment?
If the fan has not have screws on that side, since it is a pulling fan(thereby may only be threaded on the other side). Some force to turn the screws will be needed as they cut there own way into the plastic.