For some simple hardware like that, the dealers aren't horrible because shipping will kill any savings.
I believe that you are looking for VW# 1k0 825 951 . There are 3 of those and they are m6x20 but I'm not 100% sure they are the correct ones. They only other ones for the undershield are : VW# n 103 546 02 . There are 8 of those, possible that they are the ones as well. If you have to order some parts like filters or oil, add those and it'll be worth it.
Home depot has a specialty rack where they have auto type fasteners. Your local auto parts store has SS hardware as well. They should be 20mm long, check the threads as well.
I believe that you are looking for VW# 1k0 825 951 . There are 3 of those and they are m6x20 but I'm not 100% sure they are the correct ones. They only other ones for the undershield are : VW# n 103 546 02 . There are 8 of those, possible that they are the ones as well. If you have to order some parts like filters or oil, add those and it'll be worth it.
Home depot has a specialty rack where they have auto type fasteners. Your local auto parts store has SS hardware as well. They should be 20mm long, check the threads as well.