Configurable inlay to match IKEA Lökö parasol foot to IKEA Kuggö / Lindöja parasol or umbrella

A few years ago I purchased an IKEA Kuggö / Lindöja parasol (or umbrella), with an IKEA Lökö parasol foot to hold it in place. The parasol foot came with an inlay to match the size of the parasol's pole to the generic foot, which is large enough to fit many parasols.

Unfortunately, the inlay “shim” I had has gone missing. I took some measurements and modeled this fairly easy piece in FreeCAD. I have made the model configurable, look at the “Dimensions” in the FreeCAD document - changing those should make it possible to match this shim to almost any dimensions required.

I've printed mine in black PLA, making it fairly robust with 4 perimeters. It will take a beating when the parasol is up and the wind blows, so try to make it sturdy.