VA springs not TÜV suitable?

Hai people have the following problem. I recently looked at my DOHC 92` and had to find out funny whites that the two front springs are aggressively infested by rust. Since when is there such a thing? My question is actually what do I have to consider when expanding? because I have next month tuv and I don’t want to stress so I thought with that I just do other springs pure. is the best solution or?