Grooved-grooved frames are for all plastic foundations and natural foundation when cross-wired. I would go with the new Kelley frames with grooved end bars too. If you run Duragilt through an extractor, you will be installing new foundation if the edges are not secured. Wedge top bars are for vertically wired foundation with hooks. If you can make slotted top or bottom bars last, you are a gentle beekeeper.