Prior to ordering do check in your float bowl that you have a round recess in the location that the screen will fit into. There are early float bowls that do not have the provision to hold the screen in place.
This is the screen that goes in the float bowl adjacent to the accelerator pump well. These are good used screens as these correct screens are not reproduced. 99 % of the time they are missing. They were originally in all three carbs. I would at least place one in the center carb as that carb is always drawing fuel.