I've read the archives and I'm stll confused. The brackets I have for the sill trim (under the doors) are white "H" type. I've read that the new brackets don't work Is the white bracket the new style? Or is the black the new style?

Also, I can't figure-out how the front steel bracket fits into the trim. Do you insert it in the trim and slide it to the front? Which way does the "U" shaped bracket fit? Flat side vertical or horizontal?