I am trying to attend to some details on my 69E coupe and have been unable to locate the white plastic rivets that attach the outside threshold(sill) plate to the car. Can someone point me to a source?

Also just a note regarding a somewhat related topic.
If you don't have safety wires on your garage door springs(ones with two outside springs), consider getting a wire put in the spring to contain the spring should it break unexpectedly. It will save your car from being mangled by the flying spring, not to mention people or pets in the vicinity. I had one break, but luckily there was nothing in harm's way.
Scott