The Bentley (I think the Bentley) says to use Butyl cord, it is a kind of adhesive line thingy. 101 Projects says you may be able to reuse the adhesive that is currently on the foam. I haven't gotten into my doors yet on the Boxster (although I need to to fix a microswitch) but on other vehicles I have been able to reuse the existing adhesive.
If you can't find at an auto parts store you may be able to find a Lowe's or Home Depot.
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