Now I'm feeling bad for hijacking the 'What have you bought thread'so this triangular thing has to be fully sealed?
strangely enough mine was missing both of them and thought it was supposed to be like that for draining or something… well, well, I always learn.
There is an internal channel behind the triangle piece that allows water to run off the front seal and down the A-pillars. Block this up and you're in trouble. But, if the triangle piece is open (or not there) from this channel to the hood closing interface then water can find its way from the channel, past the interface and into the cabin. This was my issue and the fix was to re-attach the triangle piece to the seal while not blocking the channel.
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