Where can I find quarter round in pine larger than 21x21?

[ElFeo2]

I have a house with window frames that might have worn 60s style. There is quarter round in pine around them with an approximate dimension of 27x27. The largest size I can find on the market is 21x21. Where can I find larger? I am located in Stockholm, and I need about 9 meters, so I guess it will be expensive per meter with shipping.

 

[Huzzbutt]

EHL has it in their range, I don't remember if they are sold by the meter or in bundles but if you can't find someone who has it in stock, the easiest way to get it is to visit a sympathetic timber yard that already sells EHL and ask them to order the desired lengths including offcuts with the next delivery.