USB 3 PCI Express Card Adapter for 54mm Slot of Laptops - YouTube
Dell laptop's ExpressCard slot comes with a ruler and list of unit conversions (xpost /r/mildlyclever) : r/pics
Laptop computer with American Express card in drive slot Stock Photo - Alamy
StarTech.com 1 Port Flush Mount ExpressCard SuperSpeed USB 3.0 Card Adapter with UASP Support Add a USB 3.0 port connection that inserts flush into a laptop ExpressCard slot slim usb 3.0 expresscard - Office Depot
SanDisk launches ExpressCard adapter: Digital Photography Review
ExpressCard - Wikipedia
Amazon.com: JMT PCIE EXP GDC External Laptop Video Card Dock Graphics Card Laptop Docking Station for Beast Mini PCI-E/NGFF M.2 / Expresscard (Only Expresscard Cable) : Electronics