[fdryer]

Unless someone knows the exact bolt size and thread, the easiest way to find out is either having or removing a similar bolt that fits the bolt hole or remove another abs sensor bolt (preferably not seized in place) to have for matching a replacement. Whenever removing nuts or bolts, if you can anticipate corrosion, sometimes seen as rust or severe corrosion), spray penetrating fluid to allow it to soak in and loosen seized fasteners. Sometimes heat or some hammer blows can help break corroded rust and bolts creating the mechanical equivalent of loctite.