Covers for Ikea Ektorp sofa CUSHIONS in the discontinued fabric Byvik floral. There are 4 cushion covers in total: 2 back cushions and 2 seat cushions. The covers have been used but are still in perfectly usable condition: the floral pattern is not significantly faded, still pretty vibrant, only one cushion has a faded/yellowed area (see second photo) but I would just put that side towards the back and it's invisible. That single imperfection is reflected in the price. (The frame cover does also exit, but it has significant wear and fading to the armrests. In case you're interested in it, it is listed for fabric on another listing.)
eBay