Those 15s are easy to refoam. For the dustcaps, I try to stick the tip of a pin in the cap sideways and try to pull the dent out. Can't do that with the aluminum dust caps. The felt dust caps on the CV have no effect on cone alignment, so it will not matter which you do first. I would try and fix the original dust caps, replacing them will never be as good as the originals. But if you choose to replace them, you have to cut them out and re-glue the slightly larger replacement dustcaps over the old glue line. I just don't like that look.
The foam is more critical in alignment. Cut off the cardboard gasket by slicing it away from the frame, keep it for re-use. Once you get all the old foam cut away from the speaker cone with a new razor blade, get the rest off of the speaker frame. Apply the glue to the top edge of the speaker cone and center the few foam using the old foam edge as a guide. Let that dry.
The foam should be resting slightly above the speaker frame. Then apply the glue to the speaker frame. Lift the cone up from the bottom and make sure the voice coil is not rubbing, lift it up and down a few times to make sure it is centered then pull it down into position. The glue will grab but not permanently. Push on the face of the cone to make sure it is not rubbing, if it is re-position and try again. If its good, tap it down all the way around. Add some more glue and attach the gasket. make sure the holes align and then turn the speaker over and set it on the bench until the glue dries.