Adapter Plates screws Stand 6 / Stand 20

What type of screws/bolts are used for the adapter plates for Stand 6 and Stand 20

If you lose the screws/bolts of your adapter plates, it is not a spare part you can order from a Dynaudio dealer, but they can be found in many specialized stores. 

Heritage Special adapter plate:  M6x16 hex socket flat cs

Contour 20 adapter plate: M8x20mm DIN 7991