someone asked me about a anco number for the wiper arms for a early dual motor 40/45, but i don't remember who. i've tried them out, and the part number is 41-01. this changes the blade mount to one like the middle 40/45's with the single upper wiper motor (the flat bar with a knob on it), so you don't have the funky wiper blades anymore. i don't remember the part number for the wipers for the middle years, so i'll try to figure that out sometime.