I have the bolts and adapter somewhere. Let me look and I'll let you know.I have lost one of the two bolts that hold the oil cooler adapter cup to the block. GM #9441916 Part has been discon't. Ebay is out. Nobody makes a 5/16-18x3 1/4 anymore.
Willing to buy both bolts and the adapter cup, if you don't want to break them up.
Thanks,