I have a pretty good collection of Dremel bits and unfortunately they are no longer in packaging. This means I have no clue what part numbers they are?
Just look for bits like these and you'll be doing well. The rasps are great for getting the big chunks off then I move to the stones a good for final surface smoothing. The round ended bit works well in small holes, as may be used for a single wire. It works well to smooth the back side of the hole inside the guard if you can't get the angle with a straight wraps or stone......