These are Cadillac LED door sill inserts of some type. I searched every model number on the box and number on the actual LED and found nothing. They were being shipped to a GM plant so we know they are a genuine GM part. No idea why nothing will come up as to what they fit. If you know please let us know.

I see similar LED Cadillac items anywhere between $150-$350. Our price is way better. They fit LH and RH sides. 

They measure 5 and 5/8 including the insert lip on each end. 

1 and 3/16th wide.

Total thickness would be 3/16th.

Model numbers on box: Buyer M/N 26457  Manufacturer part number 1800060

If you can use them they are a great deal.