I think this is the same part no as the one on my D2 S8 FE, and if that's the case that's a pretty good total price for 4 new caps - it's about 1/2 the price of new ones from Audi (with some discount from the dealer), and about 2/3rd of the second hand price, where I think you're really taking a bit of a risk that's not worth the relatively small saving.
If you're happy they're kosher, then I'd get those - and I might follow your lead, as there's plenty left
