cavalier z24 2000 / manual

hey guys i just recently purchased my car.
I jacked my car over the weekend to only find 2 bolts missing
from the oil pan to the tranny housing!

i want to get this bolts replaced!

Does anyone know the size thread or head size or
the gm part # for these bolts, any help would be great thanks
in advance!

here is the photo i took to show
where the 2 bolts are missing

http://www.photobox.co.uk/album/5377580