I took a gamble and bought some stainless steel door sill inserts from Ebay.
A lot of this sort of thing is not well made. Well these are. Not cheap, but quality without compromise and highly recommended.
I was so pleased I gave the seller permission to use my photos
https://www.ebay.co.uk/itm/LAND-ROVER-D ... 2749.l2649
If the link expires search ebay for the seller 'Barmeka' I think it finishes the vehicle beautifully.
Post pictures of your Disco 5 here