I watched a video and saw that 4 each rivets have to be drilled out. The part number I have for the rivets is TK2150355. The dealer said I need four of these. But he also mentioned I should get these as well: 4 each S51S51833. Do I really need these latter ones and what are they because the picture makes it look like it's just a push in type fastener. Do these get drilled out too?