width=3;
D=3;

rotate([90,0,0])
difference() {
  union() {
    //-- Base
    translate ([0,0,-width/2]) cube(size=[53,10,width], center=true);

    //-- First ear
    translate([-53/2,-10/2,0]) cube(size=[width,10,20]);

    //-- second ear
    translate ([53/2-width,-10/2,0]) cube(size=[width,10,20]);
  }

  translate([0,1,4.6])
  rotate ([0,90,0]) cylinder(h=60, r=D/2,center=true, $fn=20);

  translate([0,1,4.6+10.4])
  rotate ([0,90,0]) cylinder(h=60, r=D/2,center=true, $fn=20);
}