Where can I get custom-sized frames for a painting in Switzerland?

Hi everyone,

I have a painting canvas that's 48x58 cm, with the actual drawing size being 42x52 cm (it has a 3cm white padding). I'm looking for a frame that fits these dimensions. I checked at Jumbo and IKEA, but the frames they have are either too tall or too narrow, which cuts into the painting's width.

Does anyone know where I can find custom-sized frames or other stores that might have the right size? Any recommendations for places in Switzerland (in the area of Zürich, Basel, Bern and Lucerne)(or online) would be greatly appreciated!

Thanks in advance!