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Marvel schebler 10-3878 spark arrestor bolt size

help im looking for the 4 bolts to hold my spark arrestor on to my marvel schebler 10-3878 updraft carb. I got the boat second hand and it didn't have one on it. If you know the tread size that would be great. :bounce: :proud:
1/4 X 20 Make sure you use short bolts on the holes in the bowl so ya dont pop a hole in it