help!what motor screws for 9xl?

[cornolio]

i purchased a feigao 9xl months ago but when i tried it on my emaxx ,the 3mm motor screws were loose.i tried a couple of hobby shops but they couldnt provide me with one that fits.i talked to a guy there who tried 9xl before and told me that he used 3mm screws .where can i get screws for it?