Our toe kicks don't clip on to IKEA toe kicks by themselves, but there's an easy, cheap way to attach our toe kicks to IKEA cabinet feet.
IKEA toe kicks are designed to attach to IKEA cabinet feet without separate hardware, so we recommend buying 1-2 toe-kicks from IKEA. Their least expensive is perfectly fine, since the IKEA toe kick will be hidden during installation.
You can then cut the IKEA toe kick into pieces. Attach the smaller pieces to the backs of our toe-kicks using adhesive or short screws, wherever our toe kick needs to attach to a cabinet foot. Once the IKEA toe kicks are attached, our toe kicks can clip onto the IKEA cabinet feet.