Those are the handles that I used to use as well as the stubby version. To get them to fit, you use the splined adapter and drill it out. Make it so the adapter is still pressure fit, use the set screw, then put the handle on and line up the set screw holes. Put the second set screw in and screw it into the first set screw hole. That will eliminate the handle from spinning.
You can also use dowels to make the legs on your buildouts.