The filters and hood are the slip on type. Sometimes they are a little snug. Sometimes the "fins" get bent in or out. The hood fins can break off. If they all break off, its ok. A piece of clear tape cut to the width of the slip on depth makes for a very good fit.
Well, I don't like my fins breaking off, but if they are a little too tight, you can bend them a bit. Attach the filters first and the hood will slip on the filter.
Ive found the slip on with the fins work great. except when you try to close the camera with it still in place. They are really cheap in the second hand section of camera stores.