Amiga 3000 Screws?

[Kernel]

As the heads of all of them are stripped on my machine, does anyone know the size of the screws used for the rear of the A3000 and floppy/hard drive cradles?

I know I could probably take one into the local hardware shop and do some basic searching, but if someone has already done so, there't no need to reinvent the wheel

Thanks.

[Kernel]

I didn't know there were 2 different ones used... which goes to which?  Mine all look the same.