carpet hold down trim

The early A body cars like the 66 he is working on actually have both side plates as well as carpet hold downs.

So, question to the OP, which pieces do you need?
You are correct I have the sill plates , I am looking for the carpet hold downs that go over the lower door weather stripping and also hold down the carpet , there are also two smaller extension pieces that are beside the rear seat and under the rear panels that hold the carpet down.