Looks like they are for 66 Impala/full size. It was explained to me that the reason they look different than what I was finding when doing a search on 66 Impala is because the 66 Impala came from the factory with "bumperettes", which is what I was seeing in search results. What I have are accessory bumper guards that were used to replace the factory bumperettes.
Cool - learn something new every day!
Thanks for the responses!!