https://www.memoryexpress.com/Products/MX76860
is the card that should have been asked for as it is the denuded one without the pcie 6 pin.
shows stock in the NE and NW stores.
ask for the SKU# MX76860 for extra clarity to the salesperson.
do you know what the power supply is in the victim computer?
some of the regular OEM's (Dell, Lenovo, whatever garbage Walmart/Bestbuy sells) cut down on parts so much that user upgrade-ability is not recommended. and multimonitor nirvana may need to be reached via USB->video adapters like the above, but that requires USB 3.0
YMMV. Also it will need to fit a full height video card.
Also you may need a display port to hdmi/dvi cable as well for triple display support depending on what monitors it is being plugged into.