CPU Cooler and Motherboard Standoffs

Calcium20

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Dec 23, 2014
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So I'm going to buy a CPU radiator cooler which uses a bracket underneath the motherboard and a standoff on each corner of the bracket. My case didn't come pre-installed with standoffs for the motherboard but each corner has a slight bump which raised the motherboard anyway so the standoffs weren't necessary. In my screws bag which came with my computer, there were only 3 standoffs supplied. Is this the correct number or is there one missing? I believe I will need to buy another standoff so I can properly fit my radiator.
 
The reason for the slightly confusing question is because my old parent's computer has raisers which looked exactly like standoffs. I had a look inside the case to check out the cooler and that is what I saw.