Reddit reviews PureMounts PM-Adapt-B - Universal VESA TV Mount Adaptor Plate for VESA 50x50 up to 400x200, max. Load 30kg Variant Name
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Maybe the first shop just said that because 300x200 isn't a very standard format.
I had a 200x200 mount before and I purchased this to convert it to 300x200:
Amazon Germany Link