I am looking for and STC to buy, which limits the MTOW of my Cessna 337 (MTOW 2100kg) to 1996kg.

I have in my hands a danish issue which is named
"Reims/Cessna F337F Nr. 8/85 Maks. tilladelig starvaegt 1996kg"
It is approved by a danish authoroty (Statens Luftfartsvaesen) which is NOT the holder of that STC.

This fits STC perfect to my Cessna 337, but i need to buy this in english.

Any clue how to get the STC holder of this STC?

best regards
Reinhard Rüdiger