Does anyone know what are the dimensions of the Xbox 360 controller screws?

I recently fixed the cover on my xbox 360 controller which had cracked with a new one.

The worst point was getting those T8H screws out, and the new case didn't have very good drilled holes for them to go back in either (I ended up using a self-tapper to start the hole off).

Two of the screws have gone missing, the controller holds itself together with a bit of a hole in one corner, but I was thinking of getting a set of replacement screws and also replacing them with ones that have normal philips heads on them (and get rid of that stupid T8H head - why even use them on a controller? they're not really "security" because you can buy the screwdrivers for them anyway so they don't really stop people getting in to the item).

I went to the local DIY store and they said they've got no screws as small as that.

Does anyone know what are the dimensions of the 360 controller screws so I can find replacement philips head ones on line.