This adapter by Delock can be used to connect a PCI Express card to the M.2 key M interface. Through the predetermined breaking point, the length can be shortened from 80 mm to 60 mm.
Specification
Connectors: 1 x 67 pin M.2 Key M male, 1 x PCI Express x4 slot, rev. 4.0, 1 x 4 pin power connector