Does anyone know what screw size I should order and from where?

[The Wild wrangler]

I just got the DJ41 on the Jubilee bracelet (Ref: 126300) and resized it myself. My screwdriver was a touch too big and sort of stretched out the screws. It's locked in well and barely noticeable but slightly bothers me purely from an aesthetic perspective. I would like to order new screws and re-screw them in so it looks a little cleaner. Can anyone help me with:

1. What Screw size do I need to find and order? Not screwdriver, but actual screws.

2. What screwdriver size I need to buy? I think it should be 1.4mm?

3. Any recommendations on how and where to get it? Do I request directly from an AD? Do they even do it? Maybe just a basic watch repair shop?