Small thermostat and water neck housing on my M1 Inlet

I tried the stamped steel one but the dimples by the bolt holes were too tall and kept it from sealing. I didn't want to but I ended up using the stock magnum water neck. It actually looks OK.
http://www.autozone.com/cooling-hea...inders-z-5-9l-fi-ohv/524817_0_0?checkfit=true