If everything else is not fruitful, you can always go to the dealership.. Welcome to Copenworld, nice doggo you have there
If the rubbers aren't too bad, you could try rejuvenating them with some Gummi Pflege. I've used this in the past, and it helps "plump up" and soften the rubber seals.
I prefer this one. https://www.amazon.de/dp/B00S3M715O/ref=olp_product_details?_encoding=UTF8&me= 1 Liter sufficient for many years and also from germany
any one can suggest where to buy the 63251 972902 please? in greece not available and told me 40 days plus to order and very high price thanks in advance