I have just dug out these 4 plastic sill trims. I think they might be Opel Rekord C series, possibly D series. They bear the following part numbers; 3468175 & 3467366.
They are by no means mint, but might replace a lost or broken one. They go in the scrap bin today and are up for grabs for free. The bin will be emptied at the end of August!

Unknown Sill Trim - Opel Rekord or Commodore?

Updates:

01/09/2011 - Now scrapped