* Delete 2 Part 6192 Dark Bluish Gray Slope, Curved 2 x 4 Double (Undetermined Type)
* Add 2 Part 6192b Dark Bluish Gray Slope, Curved 2 x 4 Double with Groove
* Delete 2 Part 6192 Dark Bluish Gray Slope, Curved 2 x 4 Double (Undetermined Type)
* Add 2 Part 6192b Dark Bluish Gray Slope, Curved 2 x 4 Double with Groove