Ok Mate,They can't be removed..They've been welded in and I aint using the angle grinder on that Duck..
Also I want a little Ducky raincover so it doesn't get wet in the winter
In that case, do a combination of what myself & Don said.
Remove the nuts & washers. Stand the duck on a sheet of cardboard. Poke the threaded parts through the cardboard. Then draw around the base of the duck.
Cut around the circular outline & tidy up the two holes.
Hey presto, one template