just ordered 12 of that last week.
the package I have says 'SLIDE CORNERS"
there is also a number on the package(02115 11)
I ordered ours from Tri County RV in Mossville, Illinois.
our local dealer could not find them and said they where no longer available, but Tri County did not have a problem ordering and shipping to me at a very good price.
they are wonderful to deal with in my book.
as always, your mileage may vary.