Ive been trying to put a V-Nand 950 into case I need to know the size of the standoff on the circuit

[Davidneedshelp]

Im trying to put a V-Nand 950 into the case I need to know the size of the stand off because for some reason my Motherboard or Case didn't come with one or the V-Nand. The Mother board I have is a X99 Extreme4 from Asrock. Every picture of the x99 that I have seen has had the Standoff in it Mine does not and did not come with much of anything besides the motherboard. Basically my question I need to know is What size is the Standoff I need for this Motherboard Circuit.