Defender rear door sill

Hello,
I'm trying to locate a part below the rubber seal under the rear door. It has 6 fixings in it and has corroded quite badly on my Defender 90 '07 with many holes.
Any help with a part name and link would be appreciated.

Welcome to LoonyZone

Oooh, you should introduce first but this might be what you're after. Regards.....
http://new.lrcat.com/#!/1235/674/675/150/1801
https://www.paddockspares.com/seal-43.html

Or is it the Retainer you need?.....
https://www.paddockspares.com/catalogsearch/result/?q=AFP710120

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