The Rosso twins are
Join Date: Oct 2011
Location: United Kingdom
County: Tyne and Wear
When (if) you do manage to get some, file down the little barb that holds them in, wants to be just enough to hold them in snugly, then find a screw/rod etc made from steel just wide enough to fit inside the tube bit on the reverse of the plug right to the end, then seal it in with a blob of silicone.
Now when you need to remove them use a strong magnet and they will pull straight out, saves trying to find more if you ever need to remove the door card again, had mine out a few times in 2 years of owning it and saves the hunt for new ones.