Motor Mount For each motor mount you’ll need: – 2 #6 1 1/4 (M4 32 mm) regular screws and nuts – 1 #6 1 1/4 (M4 32 mm) flat-head screw and nut – 2 #6 1 1/2 (M4 38 mm) flat-head screws and nuts (to attach motor holders)