Missing M.2 Standoff for Precision 3640

Hi,

Does anyone know what type of M.2 stand off would fit the precision 3640 motherboard. Currently the motherboard does not have any stand offs for both M.2 slots just a screw as seen in the image below. I tried a few other stand offs but they don't fit as the size of the hole on the motherboard is too big.

I am not sure if an stand off is needed in this case as the M.2 connector is also quite low on the motherboard (height wise) so I am not sure if I should just be using that screw that came with the motherboard to attach the SSD without any stand offs.

If anyone knows what type of stand off would fit this motherboard or if it doesn't need one by design please let me know.