there are 3 long seals under the hood, which do you need? there is the one at the hinge point of the hood. there is the one at the back edge of the engine bay / firewall (has the kinks at either end) and then there is the one that wraps around in front of the windshield.
it is hard to find most of these as used pieces ... w+n sells all 3 of them new (prices in euro plus shipping)
body 41/15
11 A51711810529 rubber seal under hood front 29.66
17 A51715780175 rear engine compartment rubber seal 41.13
18 A51711810531 engine compartment rubber seal (firewall) 28.53