You're serious man Goran
I'll find part numbers if you need although ETKA is self explanatory. I have purchased them in batches, so it'll be a bit difficult.
The only two seriously expensive parts are undertrays themselves, but they can be sourced from zee German eBay if you don't mind used stuff. Key words are Motorschutz or Unterfahrschutz.
The whole kit can be ordered all together from one salvaged car.