Used this to convert a Dell XPS700 from BTX to ATX. Worked like charm, some Dremel work and use of a pop-rivet gun, you honestly can't tell it didn't come that way. The 120mm -barely fits, required some extremely careful cutting and measuring. The tray w/dual 80mm fans would be more forgiving, but it all worked out in the end. The workmanship of the tray is top-notch, I highly recommend this product.