Are you looking for a new one or a used one?
Either one is oke, or the part number. There is a company in The Netherlands but they do not have the part lists before 1994.
Phil's Auto Salvage USA-CO(Hotchkiss)(NNN) NNN-NNNN/p>
Lamar, Inc. Auto Wrecking USA-WA(Goldendale) 1-509-773-3420
Hayes Auto Parts USA-KY(Bowling-Green) 1-270-843-4889 1-270-843-1762
Here are some places that show core engines. Nobody lists the housing by itself, but these engines are for parts so they could remove that part for you. If none of these leads pan out for some reason, let me know and I will locate some more for you.
Can you supply emailaddresses? I do not live in the US.
From my experience many of these places do not answer email. Phone calls are the best way to go. I put them down for you anyway though!