Yes the ones on my P38, it was all four that sort of bubble up under the rubbers (its ali inside), the door rubber surrounds.
The ones visible from outside. they are a common problem on the P38.
Have been to the dealer and they very expensive but had to go to two dealers as they don't make them anymore, so it a case if they have any sitting in the dark?
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They are about £60 each with the VAT and I have replecaed all mine now for new ones.
(To buy these anywhere else?) well I don't think so and RR are not making them anymore so you have to ring up dealers all over the land with a part number will help? also refitting them, its better to strip the doors down take a 4\5 hours to do all four?