I fitted Outback panniers to my 2017 DL1000 a while back. The top part of the frames mounted using the oem bolts that hold that bit of plastic near the seat, but involved making the holes bigger though fit a spacer. As an temp fix, until you can source the right parts, you should be able to fit the Givi racks by just removing the oem part.
Might be worth asking around the local dealers to see if they have any origanal, none pannier bits laying around.