Here is the combination water pump housing and timing case cover from a 1958 Oldsmobile V8.  The casting number is 572150, and I believe this remained unchanged into the early 1960s, but I don't know the specific range of years that it's correct for.  Is in good undamaged condition, with no sign of cracks and no rust damage (just surface rust).  All mounting ears are intact, all threaded holes are good, etc.  Buyer to pay shipping based on location, $45 for the eastern half of the US and $30 for the west coast (if you're on the west coast and the eBay system forces you to pay the full shipping charge, I will refund you the difference of $15).  International buyers, please inquire for a shipping quote.