The standard lower seam trim is a u-shaped chrome plastic molding that slips over the rocker panel flange seam. Supplied in a length long enough for one side of an classic Mini Estate or Saloon (sedan). Hang it before installing to remove the curl and/or use a heat gun to help shape it. Good quality reproduction part. Ref: GZF107A, GZF0107A.
See GZF0105A for deluxe trim version.