cracked oil pan

my 97 autobahn took a cement block on the oil pan and knocked good size hole in it- removed the oil pan and found out there is a plate with perhaps some circuit board on it pancaked between the oilpan and the block that also had edge chipped on it and needs replacement. I have tried to find a part number for it but had no success in ordering one from GMpartsdirect- was told it was an oil manifold- anyone help with part # ?
Also will need the lower crossover exhaust pipe if anyone has extra one
Thanks
Andy