I went to do my front brakes today as the pads are getting low. Managed the nearside no issues but when I've come to do the drivers side, the caliper screw has been rounded off

My plan is to use an oversized socket (9mm or so) hammered in to the screw to remove it. Or use an easy out screw extractor. But does anyone have another suggestion, or know how much the screws are at Ford?

Also I think I need to bleed my brakes so anyone know the nipple size? I think it's 8mm but when I had a quick go it was stuck solid

Cheers lads