So, I'm currently rebuilding a 1993 MM. As I'm filling it with coolant, I find a massive leak. Well, as it turns out, I forgot to scrape the old gasket off this piece, causing it to break when torque was applied. I've searched and searched, and image searched and asked and nobody knows what this piece is so I can't replace it

What it is a cast aluminum piece that bolts to the intake. From there, the thermostat sets in it and the water neck bolts over it. I've tried searching for days but can't find a replacement. If anybody knows what this piece is called or has a link for a replacement, that would be perfect!