Olli, Buick supplied either Stromberg or Carter carburetors for that model. These were also found on late 1942 and 1946 models.
The Carter unit was a WCD-609S, Buick part number 1330947. Later 1331882 was used for rebuilt units.
The Stromberg unit was a type AAV-26, Code 7-57, Stromberg part number 380097, Buick part number 1325568.
A couple of places pop up after Googling the above brands and numbers. They indicate rebuilt units are available.
Carburetor Exchange www.carb-x.com and The Carburetor Shop www.thecarburetorshop.com The latter place comes highly recommended by guys in another forum dealing with Cadillacs of this era.
What has been, can be again. (Bob Wills, 1942)
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