We had a 2008 GP sitting at the barn for a few years and at some point the wiper arm nuts were removed. Fast forward to now, car's all fixed up and the last thing it needs are the wiper arm mounting nuts.
GM parts says the part number is 11589150, but we got that in and it's too small! http://www.gmpartsdirect.com/pontiac...&position=left
Does anyone know the size nut the wipers need?