(SSD) Mini PCIe Flash Modules are manufactured in either a 50mm or 70mm length. The only difference is the length in the dimension of the Mini PCIe PCB board.
At the opposite end of the connectors will be two holes for the screws to fix the Flash Module to the motherboard. Ensure you consult your manual to determine which size Flash Module you require before purchasing - a 50mm module will be too short to fit into a 70mm Mini PCIe bay and a 70mm module will be too large to fit into a 50mm Mini PCIe bay.