Harry Henning posted:Most ALL pre war "O" & "STD" were 4:36 or 6:32. Most all trim pieces were 4:36, including bells, whistles, pantographs, "O" motor mounts to frame, steam boiler fronts, & body mounts. Std. ,most common was 6:32 motor mounts, frame mounts, gear plates. Body mounts 4:36 or 6:32. Most std. car trim were 4:36, there again same for bells, whistles and pantographs. As far as I know, 4:40 was a post war item. Harry
I know the body mounting fillister head screws are 4-40.