I came across these pictures on the "Archief Eemland" website, the city archives of Amersfoort.
First picture was taken on 4 june 1945, during a demonstration of Canadian military equipment. On the left you can see two Anti-aircraft CMP's, one with Bofors 40mm and one with quad Polsten.
The second picture is probably the same vehicle on it's way to the demo.
source:
www.archiefeemland.nl
Alex