Dell Wyse 5070 thin client SSD screw standoff mount / nut where to buy?????????????

Hi guys

Where to buy that SSD screw standoff mount nut????  I can't believe it not come with on board!!

screw thread size is 3mm but the tall is not common  

How can dell not supplied by default???? What is the point to remove it by default??

Any guy can tell where can buy one???

Thanks!

Best regards,
Joe