I didn't even bother asking as Seat by the sound of things from my local dealer are not wanting to do anything under good will etc,
Mine was the felt under the actual bonnet, it was sagging that much as it was so wet that that engine cover has a scuff mark on it and the oil filler was full of water which froze in winter!
I have now used the
guide on here to fit the rubber seals under the black trim on top of the bonnet, and I have changed the under bonnet felt as well (not cheap, I'll check the receipts later but I think it was about £60 or so on trade! I did run without it for a while but it was annoying my OCD that it wasn't there)
All seems ok now, I wash the car atleast once a week normally and so far no water in the engine cover etc