Apogee GT Screw Replacement!

hey, i managed to round out the heads of two of the screws on my apogee gt while trying to really crank it down and get better pressure on the block.
im gonna be heading out into town soon, and was wondering if anyone knew what screw type and length are needed, as i would rather not have to turn off my computer, and take one of the screws with me to compare, it'd be easier to just go in looking for screw 'x'