01 Santa Fe Rotors
 

I'm trying to replace the front and rear rotors and pads on a 2001
Santa Fe (6cyl,awd,16" tires), After numerous attempts, with a hand
impact driver, to loosen
the 2 screws holding the rotor on the screwheads finally sheared off.
My question : are the screws required? I have to order the screws
because dealer doesn't stock them. I would hate to have to drill and
tap the holes for nothing. Thank you in advance