Does anyone know the specs of an appropriate wall anchor for use with the longer, coarser-threaded section of this screw, and where I can buy exactly two of them? As best I can tell, that section is an M6 wood screw, 35mm long. It’s going horizontally into a hollow drywall wall, no studs are available, and it’s got to support a vertical load of approx 25 kg (60 lb).

Needs to be either an online storefront or local to Pittsburgh, PA.