the mk2 sills came in a few varieties, I think you'd be better off sourcing the plastic sill with plastic clips, or plastic sill with full height metal clip, there is a good case to get the clips remade in alloy (laser cut with folds) based on the full height ones.
The majority of sills seem to have the half height clips that bond to the side of the sill which when corrode deform the side causing the dimple effect.
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